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	<title>dr2blog &#187; Nerd stuff</title>
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		<title>dr2blog &#187; Nerd stuff</title>
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		<title>Bug report, various web servers</title>
		<link>http://dr2chase.wordpress.com/2009/11/27/bug-report-various-web-servers/</link>
		<comments>http://dr2chase.wordpress.com/2009/11/27/bug-report-various-web-servers/#comments</comments>
		<pubDate>Fri, 27 Nov 2009 17:02:38 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/?p=620</guid>
		<description><![CDATA[I&#8217;m trying to get graphics handled nicely (for at least Safari and Firefox), and it appears that web servers are behind the times.
Plan A, was to put up PDF files, which display great in Safari, but not at all in Firefox.
Plan B was to put up SVG files:
gs -sDEVICE=svg -dNOPAUSE -sOutputFile=`basename $1 .pdf`.svg $1 &#60; [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=620&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p>I&#8217;m trying to get graphics handled nicely (for at least Safari and Firefox), and it appears that web servers are behind the times.</p>
<p><span id="more-620"></span>Plan A, was to put up PDF files, which display great in Safari, but not at all in Firefox.</p>
<p>Plan B was to put up SVG files:</p>
<pre>gs -sDEVICE=svg -dNOPAUSE -sOutputFile=`basename $1 .pdf`.svg $1 &lt; /dev/null
</pre>
<p>but they were really big.</p>
<p>Plan C was to put up compressed GZ files (.svgz), but despite claims all over the web that this was the way to do it, it didn&#8217;t work, either in Firefox, or in Safari.  However, Apache configuration is notoriously arcane and horrible.</p>
<p>The web server that handles these requests:</p>
<p><a href="http://homepage.mac.com/dr2chase/WP/SVGTest.html">http://homepage.mac.com/dr2chase/WP/SVGTest.html</a></p>
<p><a href="http://homepage.mac.com/dr2chase/WP/HV_ctlr_6_crystal_imon_filled.svgz">http://homepage.mac.com/dr2chase/WP/HV_ctlr_6_crystal_imon_filled.svgz</a></p>
<p>needs to include the Apache equivalent of</p>
<pre>    AddEncoding x-gzip .svgz</pre>
<p>I have tested this fix on my own laptop, running MacPorts Apache2,<br />
serving files from my local disk.  Failing to include that directive<br />
yields either (for the direct reference to the svgz file)</p>
<pre>This page contains the following errors:

error on line 1 at column 1: Encoding error
Below is a rendering of the page up to the first error.</pre>
<p>or little broken-graphic boxes if they are embedded.</p>
<p>The MIME type IS being set correctly, but the compression is not.</p>
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		<title>Yeah, right.</title>
		<link>http://dr2chase.wordpress.com/2009/11/25/yeah-right/</link>
		<comments>http://dr2chase.wordpress.com/2009/11/25/yeah-right/#comments</comments>
		<pubDate>Wed, 25 Nov 2009 19:46:07 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/?p=591</guid>
		<description><![CDATA[&#8220;Don&#8217;t worry as its completely SAFE&#8230;&#8221;
Brilliant, to pretend to be Adobe intruding into your browsing to update Flash (with no close button, of course), because that&#8217;s just the sort of abuse I&#8217;ve learned to expect from them.  So maybe it&#8217;s Adobe, maybe not, who can tell?

Posted in Nerd stuff      [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=591&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p>&#8220;Don&#8217;t worry as its completely SAFE&#8230;&#8221;<span id="more-591"></span><br />
Brilliant, to pretend to be Adobe intruding into your browsing to update Flash (with no close button, of course), because that&#8217;s just the sort of abuse I&#8217;ve learned to expect from them.  So maybe it&#8217;s Adobe, maybe not, who can tell?</p>
<p><img src="http://dr2chase.files.wordpress.com/2009/11/flysketchexport.png?w=432&#038;h=194" alt="FlySketchExport.png" border="0" width="432" height="194" /></p>
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		<title>Priorities</title>
		<link>http://dr2chase.wordpress.com/2009/10/25/priorities/</link>
		<comments>http://dr2chase.wordpress.com/2009/10/25/priorities/#comments</comments>
		<pubDate>Mon, 26 Oct 2009 01:16:36 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>
		<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/?p=568</guid>
		<description><![CDATA[I fix my (car) brakes, and I fix my (car) stereo.  The rest, oh well.
The new speaker did not fit in the old speaker mount, despite being the same &#8220;size&#8221;.  Marine plywood to the rescue.  This is the second one I&#8217;ve made like this, and it went unexpectedly well.  A dremel [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=568&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p>I fix my (car) brakes, and I fix my (car) stereo.  The rest, oh well.<span id="more-568"></span><br />
The new speaker did not fit in the old speaker mount, despite being the same &#8220;size&#8221;.  Marine plywood to the rescue.  This is the second one I&#8217;ve made like this, and it went unexpectedly well.  A dremel is wonderful &#8212; and I just set the saber saw at 45 degrees, and free-handed a marked circle, and it came out nice.  But, again, marine plywood wins big &#8212; strong, no cutting, no splitting.  I don&#8217;t think I could have cut low-grade plywood or regular wood that close without cracking it in the process.</p>
<p><a href="http://dr2chase.files.wordpress.com/2009/10/img_4533.jpg"><br />
<img src="http://dr2chase.files.wordpress.com/2009/10/img_4533.jpg?w=700" alt="IMG_4533.jpg" border="0" width="700" /></a></p>
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		<title>Blocking outbound access by IP with Tomato router firmware</title>
		<link>http://dr2chase.wordpress.com/2009/10/12/blocking-outbound-access-by-ip-with-tomato-router-firmware/</link>
		<comments>http://dr2chase.wordpress.com/2009/10/12/blocking-outbound-access-by-ip-with-tomato-router-firmware/#comments</comments>
		<pubDate>Tue, 13 Oct 2009 03:21:23 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/?p=556</guid>
		<description><![CDATA[Turns out, you do it with Quality of Service.  Infinitely low, that&#8217;s the answer.


And don&#8217;t forget to click &#8220;Save&#8221; at the bottom of the page.
Posted in Nerd stuff       <img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=556&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p>Turns out, you do it with Quality of Service.  Infinitely low, that&#8217;s the answer.</p>
<p><span id="more-556"></span><br />
<img src="http://dr2chase.files.wordpress.com/2009/10/5263afbc-1c27-4131-89ce-c04b89c5dedf.jpg?w=731&#038;h=552" alt="5263AFBC-1C27-4131-89CE-C04B89C5DEDF.jpg" border="0" width="731" height="552" /></p>
<p>And don&#8217;t forget to click &#8220;Save&#8221; at the bottom of the page.</p>
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		<title>I CAN haz flying car!</title>
		<link>http://dr2chase.wordpress.com/2009/10/03/i-can-haz-flying-car/</link>
		<comments>http://dr2chase.wordpress.com/2009/10/03/i-can-haz-flying-car/#comments</comments>
		<pubDate>Sat, 03 Oct 2009 18:03:01 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/?p=530</guid>
		<description><![CDATA[Terrafugia brought their car to the Unconference at Sun Thursday.  I think I like the idea of the flying car, more than the actual thing; or rather, for that money, I like other things more.  But still, a flying car!
Click the pictures for full size &#8212; you know you want to.
1300 pounds of [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=530&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p><a href="http://www.terrafugia.com/">Terrafugia</a> brought their car to <a href="http://web.me.com/masstlcwebmaster/MassTLC_2009/Welcome.html">the Unconference</a> at Sun Thursday.  I think I like the idea of the flying car, more than the actual thing; or rather, for that money, I like other things more.  But still, a flying car!<span id="more-530"></span><br />
Click the pictures for full size &#8212; you know you want to.</p>
<p>1300 pounds of carbon fiber, 100 horsepower of aircraft motor (but runs on auto fuel).<br />
<a href="http://dr2chase.files.wordpress.com/2009/10/img_1604.jpg"><img src="http://dr2chase.files.wordpress.com/2009/10/img_1604.jpg?w=700" alt="IMG_1604.JPG" border="0" width="700" /></a></p>
<p>The weird triangles on stalks on the elevator are a &#8220;fix&#8221; on the prototype to improve the handling.  (I asked.)<br />
<a href="http://dr2chase.files.wordpress.com/2009/10/img_1607.jpg"><img src="http://dr2chase.files.wordpress.com/2009/10/img_1607.jpg?w=700" alt="IMG_1607.JPG" border="0" width="700" /></a></p>
<p>Nothing says &#8220;safety&#8221; like an explosively deployed rocket parachute.<br />
<a href="http://dr2chase.files.wordpress.com/2009/10/img_1608.jpg"><img src="http://dr2chase.files.wordpress.com/2009/10/img_1608.jpg?w=700" alt="IMG_1608.jpg" border="0" width="700" /></a></p>
<p>And the wings really do fold automatically, it was fun to watch.</p>
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		<title>Tomato router software, works very nicely</title>
		<link>http://dr2chase.wordpress.com/2009/09/13/tomato-router-software-works-very-nicely/</link>
		<comments>http://dr2chase.wordpress.com/2009/09/13/tomato-router-software-works-very-nicely/#comments</comments>
		<pubDate>Sun, 13 Sep 2009 14:06:31 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/?p=489</guid>
		<description><![CDATA[Friday morning I installed Tomato 1.25 on a Linksys WRT54G 2.2 router, and it went swimmingly.
Except for changes to the admin/root account info and dynamics DNS, it picked up all the settings from the previous (Linksys) firmware.
Other than tweaking the power slightly upwards, I have not looked into the bells and whistles much, except to [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=489&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p>Friday morning I installed <a href="http://www.polarcloud.com/tomato">Tomato</a> 1.25 on a <a href="http://en.wikipedia.org/wiki/Linksys_WRT54G_series">Linksys WRT54G 2.2 router</a>, and it went swimmingly.<span id="more-489"></span><br />
Except for changes to the admin/root account info and dynamics DNS, it picked up all the settings from the previous (Linksys) firmware.</p>
<p>Other than tweaking the power slightly upwards, I have not looked into the bells and whistles much, except to study our bandwidth use.  If it turns out that we&#8217;re not using, or not getting, the peak bandwidth promised by our cable company, I&#8217;ll have a look at DSL.  I&#8217;ve <a href="http://www.dslreports.com/speedtest">checked performance at DSLreports</a> and it looks good there, but I would be completely unsurprised if they noticed test connections to that site, and gave them priority (I have, in fact, worked on benchmarking in the past, and know that cheating is industry-standing behavior).</p>
<hr />
<p>Well, gosh darn, I think I have to take back some of the bad things I&#8217;ve said about Comcast.  To test bandwidth, I fired up Vuze (= Azureus = BitTorrent) and pointed it at the South-by-SouthWest 2009 showcasing artists, gigabyte 1 and gigabyte 2.  Uploads were running at about 2Mbit/s, which I think is a lot more than is advertised.  Downloads were something like 3 times that.  The timing for the bandwidth was a little wonky; it went like gangbusters for a while, then it backed off (why?) but when I tried it experimentally just now, vroom, 2Mb/s, no problem.</p>
<p>And the mighty-fine tomato router software lets me look at this.  And it also makes it pretty obvious why ISPs might be a little grumpy about P2P; the P2P parts of the graph just dwarf all the rest.</p>
<hr />
<p>Further update: hard to tell, after two weeks, we had a spell of really wonky behavior.  Despite my best attempts to debug it, cannot tell if it was the router or the ISP.  <a href="http://superuser.com/questions/44041/wireless-speeds-using-wrt54gl-w-tomato-slow-over-time-until-the-router-is-reboot">Similar problems (and my reply) reported here</a>.</p>
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		<title>Error message FAIL</title>
		<link>http://dr2chase.wordpress.com/2009/04/15/error-message-fail/</link>
		<comments>http://dr2chase.wordpress.com/2009/04/15/error-message-fail/#comments</comments>
		<pubDate>Thu, 16 Apr 2009 03:12:49 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/?p=391</guid>
		<description><![CDATA[Once upon a time, Apple wrote this great book on human interface guidelines.  It seems nobody reads it any more.
Here&#8217;s an example of an insultingly bad error message.  A &#8220;build&#8221; failed (it means, there was a bug in someone else&#8217;s program).  It pops a little error message window, with the option to [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=391&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p>Once upon a time, Apple wrote this great book on human interface guidelines.  It seems nobody reads it any more.</p>
<p><span id="more-391"></span>Here&#8217;s an example of an insultingly bad error message.  A &#8220;build&#8221; failed (it means, there was a bug in someone else&#8217;s program).  It pops a little error message window, with the option to show the &#8220;details&#8221; of the failure.  Curious guy that I am, I ask to see them.  I get this:</p>
<p><img src="http://homepage.mac.com/dr2chase/images/EclipseDetailsHah.png"></p>
<p>The additional information in the &#8220;details&#8221; is &#8220;assertion failed&#8221;.  No hint of a log file to look at, no stack trace, no clue as to the cause.</p>
<p>The best part is not quite clear just looking at this picture.  Clearly, when I made this image, I had selected the text of the &#8220;details&#8221;, so I could copy it into a bug report to tell them about how the message was really quite uninformative, and needed to be better (I have my suspicions about the cause of the build failure &#8212; however, with no details, who knows?).  HOWEVER, this was pointless, because though the text was selectable, it was not copyable.  I took this picture so that I could capture the text to file the bug report.</p>
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		<title>Comment on a bug report</title>
		<link>http://dr2chase.wordpress.com/2009/04/13/comment-on-a-bug-report/</link>
		<comments>http://dr2chase.wordpress.com/2009/04/13/comment-on-a-bug-report/#comments</comments>
		<pubDate>Mon, 13 Apr 2009 18:08:01 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/?p=389</guid>
		<description><![CDATA[https://bugs.eclipse.org/bugs/show_bug.cgi?id=272012
I am aware that my bug report lacked diplomacy.  I hope that you would recognize that Eclipse has serious deficiencies along the path to making a good bug report.  If it is not important enough to announce the location of the log files in a dialog from which I can select the name, [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=389&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p>https://bugs.eclipse.org/bugs/show_bug.cgi?id=272012</p>
<p><span id="more-389"></span>I am aware that my bug report lacked diplomacy.  I hope that you would recognize that Eclipse has serious deficiencies along the path to making a good bug report.  If it is not important enough to announce the location of the log files in a dialog from which I can select the name, are those log files that important?  (and the crash put them in an unexpected place!)   If it is not important enough to put the plugins in a form that allows me to quickly summarize which ones I&#8217;ve got, is that information that important?</p>
<p>In short, the Eclipse UI does not look like it was designed to generate good bug reports &#8212; it put several STUPID extra steps in my way, and left it up to ME to find the information that might be relevant, or not.</p>
<p>This bug is, for me, 99% reproducible, and has been for weeks, through at least the 3.4.1 and 3.4.2 releases.  I suggest you try installing the plugins that I installed (you want a concise summary, you make Eclipse generate it more easily &#8212; I gave you an ls -l, you ought to be able to grep out the irrelevant ones), wait 24 hours, and get the latest-and-greatest Scala plugin and watch it crash.</p>
<p>I think it is highly unlikely that you actually tested this, since you need to wait for a plugin to get updated.  A link to a &#8220;how to politely report bugs&#8221; site is not evidence that you tried diddly squat.</p>
<p>Furthermore, the bugzilla UI leaves plenty to be desired.  It should let me know that there will be a chance to add attachments in a later step, it should make it clear ahead of time that there is a 65536 character limit BEFORE I generate 65k characters.  This lack of design induces pilot error and leads to pissed-off pilots, who will then not really give a rat&#8217;s ass about your snotty instructions about how to file bugs.  You think you&#8217;re an expert, yet present me with this crap UI (unselectable text in important messages)?  Puh-leeze.</p>
<p>And I think this matters.  I am a long-time Eclipse user, and my enthusiasm about recommending Eclipse has gone down in recent months.  After all, I&#8217;m going to look like an idiot if I recommend a piece of software that crashes on every update, aren&#8217;t I?</p>
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		<title>Time wasted with Microchip USB chip and Mac OS</title>
		<link>http://dr2chase.wordpress.com/2009/01/23/time-wasted-with-microchip-usb-chip-and-mac-os/</link>
		<comments>http://dr2chase.wordpress.com/2009/01/23/time-wasted-with-microchip-usb-chip-and-mac-os/#comments</comments>
		<pubDate>Sat, 24 Jan 2009 00:53:08 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/?p=264</guid>
		<description><![CDATA[This is here only so search engines can find it and other people can avoid this mistake.I bought a PIC ICD2-Pocket from SparkFun, intending to program it from my MacBook.
Long story short, there appears to be no Mac OS drivers for the USB chip.  I can find lots of advice online that tells me [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=264&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p>This is here only so search engines can find it and other people can avoid this mistake.<span id="more-264"></span>I bought a <a href="http://www.sparkfun.com/commerce/product_info.php?products_id=8558">PIC ICD2-Pocket</a> from <a href="http://www.sparkfun.com/commerce/categories.php">SparkFun</a>, intending to program it from my <a href="http://www.apple.com/macbook/">MacBook</a>.</p>
<p>Long story short, there appears to be no Mac OS drivers for the USB chip.  I can find lots of advice online that tells me about PC drivers, but I have a Mac, so that is not useful.</p>
<p><a href="http://www.colinkraft.com/macusbhid/macusbhid.php">This guy</a> seemed to be making a stab at it (in particular, his vendor ID matches), but his page is two years stale.</p>
<p><a href="http://www.dsitri.de/wiki.php?page=AJZaurusUSB">Here&#8217;s drivers for handheld devices</a>, but those seem slightly non-serial (IP?)</p>
<p><a href="http://sourceforge.net/projects/osx-pl2303/">This looks better yet</a>.  Allegedly a serial driver, for a variety of devices.  Perhaps it will suffice to edit the kext properties.</p>
<p>I&#8217;ll update this if I succeed.  If YOU succeed (with a Mac, not a PC), please let me know in the comments.  Otherwise, this is a dead end.</p>
<p>This also suggests that communication with between the USB on a PIC18F2550/4550 will not work so well.  That seems implausible, but lack of a driver, is lack of a driver.</p>
<p><strong>Update:</strong> libusb (from MacPorts, for example) can see devices without kext drivers.  I bought a Pickit2; that seems to be the better choice, and both Pk2cmd and piklab can see it (note that piklab from MacPorts does not build out of the box because it depends on arts, which is broken).  I have not yet successfully programmed the PIC, but I have not yet given it a serious try with the new programmer.</p>
<p><strong>Update 2:</strong>  The new version of Piklab at MacPorts recognizes the Pickit, but is surprised by the firmware version.  Pk2cmd seems to work, once the firmware upgrade is applied to the Pickit.  To do that, you must install pk2cmd, and then type &#8220;pk2cmd -DPK2V023200.hex&#8221; to download the new firmware.</p>
<p><strike>MacPorts has support for sdcc</strike> &#8212; no, not really, things fail later.  Better to follow <a href="http://www.freenet.org.nz/sdcc/">these instructions instead</a>, which first require installation of  <a href="http://sourceforge.net/projects/gputils/">gputils</a>.</p>
<p>Gputils you can download from sourceforge.  Be sure to choose a directory that has no spaces in its path name.  Then configure: &#8220;./configure &#8211;prefix=/opt/local&#8221;, and &#8220;make&#8221;, and &#8220;make install&#8221;.  This installs it into the MacPorts /opt/local area, which might be a mistake, but that&#8217;s a problem for another day.  It seems to build and install ok.</p>
<p>Using the instructions above (which seem a little dated, I sent email to the author, but no reply yet) I got a good deal further and installed sdcc, but assembly of part of the test program failed.  It could be for some stupid reason, but I ran out of steam.  Mail to author:</p>
<pre>
Your instructions are more helpful than anything else I have come across, but they seem to be getting maybe a little dated, and there's at least one step missing.

Dated:

3.5. Compiling/Installing the Remaining Device-specific PIC Libraries

this part doesn't match what is there any more; perhaps it is not necessary, I cannot tell for sure.

Missing:

How to get crt018.o ?

"Obviously", do this, but then it fails:

gpasm -c crt018.asm
crt018.asm:5:Warning [205] Found directive in column 1.
crt018.asm:5:Error [176] incorrect syntax. use `CONFIG KEY = VALUE'
crt018.asm:6:Error [152] Executable code and data must be defined in an appropriate section.

(Source code follows  -- perhaps there was a mistake in the cut/paste, or the html?)
----------------
   processor  18F2550
   radix  DEC
   include "p18f2550.inc"

config CODE
   DATA 3F32H

IDLOCS CODE
   DATA 1234H

etc.
</pre>
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		<title>iSync for Motorola V197</title>
		<link>http://dr2chase.wordpress.com/2008/12/12/isync-for-v197/</link>
		<comments>http://dr2chase.wordpress.com/2008/12/12/isync-for-v197/#comments</comments>
		<pubDate>Sat, 13 Dec 2008 02:00:26 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/?p=242</guid>
		<description><![CDATA[Apple now provides a tool to help you write phone plugins for iSync, but it does not work.  Long story short, I tried to use it to create a script, and it didn&#8217;t work. 
The standard explanation for this is that, of course, the user is a dummy.  However, this user is not [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=242&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p>Apple now provides a tool to help you write phone plugins for iSync, but it does not work.  Long story short, I tried to use it to create a script, and it didn&#8217;t work. <span id="more-242"></span><br />
The standard explanation for this is that, of course, the user is a dummy.  However, this user is not usually a dummy, and what I noticed was that the application kept asking me to answer questions that I had no way of knowing the answers to, and in the one case where I did know the answer (because I asked the phone, and copied its answers) the application didn&#8217;t like my answers, and reset them.</p>
<p>As further proof that the problem lies in the application, not the user, I did in fact create a script for syncing my phone.  I took an existing script, modified it in the standard way (s/V195/V197), laboriously created a TIFF file for my phone&#8217;s icon (seriously, took a photo of the phone on top of green surface, selected all the green, and embarked on a Gimp McGuffin to figure out how to make the green transparent &#8212; try it sometime, it&#8217;s like a bleeping treasure hunt), and then, copied in the <a href="http://the.taoofmac.com/space/HOWTO/Write%20iSync%20Phone%20Plugins">magic response strings from the phone</a> (scroll down, it&#8217;s there, I used<a href="http://www.traud.de/gsm/remote/"> GSM Remote</a> to feed it the AT strings).  Put the phone plugin in my Library/PhonePlugins directory, fired up iSync, and shazam, I&#8217;m sync&#8217;d.</p>
<p>The tool is willing to test my script for me, and claims that my script is defective, and is not even capable of connecting to the phone.  I am a tool-writing guy myself, and this sort of thing is ultimately depressing.  When you hear about some guy using vi, or emacs, (or, perish the though, &#8220;ed&#8221;) instead of some fancy IDE, it&#8217;s because they&#8217;ve been burned one time too often by a know-it-all tool, that lies to you, has crap documentation, fails inscrutably, and cannot even justify itself when you ask it what the problems are.</p>
<p>David 1, Tool 0.  Remember, the purpose of the tool is to help me get the job done, and it didn&#8217;t &#8212; it never succeeded, and the computer equivalent of rocks and sticks got the job done faster, and apparently correctly.</p>
<p>Update &#8212; after cribbing carefully from the Motorola K1 plug-in, I got it all the way to recognizing the phone (I replaced some arrays of single string, with plain old string).  And now, says the Plug-in Maker, &#8220;This phone cannot be tested with this plug-in&#8221;.  Hel-lo?  Is that all the information you can give me?  Is this error message going to help the user (me) get past the problem?  If only someone, somewhere, could write down some Human Interface Guidelines, that would guide developers in the better construction of error messages, so that I would not waste time at this unproductive impasse.  Golly, looks like that book is already written, sitting on the shelf right next to me &#8212; the <a href="http://www.amazon.com/Macintosh-Interface-Guidelines-Technical-Library/dp/0201622165"><b>Macintosh</b> Human Interface Guidelines</a>.  &#8220;Macintosh&#8221; &#8212; I wonder if that has anything to do with &#8220;MacBook&#8221;?  Do you suppose it is the same company?  Surely not, that would be such an embarrassing mistake.  On the other hand, maybe books are just too expensive and take up too much space; times are hard, after all.  I guess I could understand that, <a href="http://www.amazon.com/review/RJVC4TI84KH3D/ref=cm_cr_rdp_perm">if the book were not available for free PDF download</a>.</p>
<p>If you need the plugin yourself, click the phone, unzip, and move it to Library/PhonePlugins/ (either the main Library, or your own Library).</p>
<p><a href="http://homepage.mac.com/dr2chase/WP/MOTV197.zip"><img src="http://homepage.mac.com/dr2chase/WP/V197.png"></a></p>
<p>Oh yeah, this is for USB syncing.  You want Bluetooth, you figure it out yourself (but please let me know the incantations, if you  do).</p>
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		<title>Wrist watch instructions, Ascent watch</title>
		<link>http://dr2chase.wordpress.com/2008/11/22/wrist-watch-instructions-ascent-watch/</link>
		<comments>http://dr2chase.wordpress.com/2008/11/22/wrist-watch-instructions-ascent-watch/#comments</comments>
		<pubDate>Sat, 22 Nov 2008 16:45:59 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/?p=240</guid>
		<description><![CDATA[Lost them once, never again.  This watch has no other ID on it, it has a black body and strap, yellow buttons and trim.
Set/Reset takes you in and out of setting mode.  This is not a watch to leave rattling around in your pocket, purse, or backpack.  Initially, the seconds (little circle, [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=240&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p>Lost them once, never again.  This watch has no other ID on it, it has a black body and strap, yellow buttons and trim.<br />
<span id="more-240"></span>Set/Reset takes you in and out of setting mode.  This is not a watch to leave rattling around in your pocket, purse, or backpack.  Initially, the seconds (little circle, upper right) blink.</p>
<p>Mode takes you from seconds to hours, minutes, month, day, weekday, 12/24.</p>
<p>Start/stop advances whatever you are setting.</p>
<p>To set the alarm, use Mode to change to alarm mode.  In alarm mode, the alarm can be adjusted with the Start/stop button.  Set/Reset takes you to/from time setting, where you can choose the hour and minute for two different alarm times (which by default, seem to be the same time).</p>
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		<title>Wrist watch instructions, Sharp SHP2092</title>
		<link>http://dr2chase.wordpress.com/2008/11/22/watch-setting-instructions/</link>
		<comments>http://dr2chase.wordpress.com/2008/11/22/watch-setting-instructions/#comments</comments>
		<pubDate>Sat, 22 Nov 2008 16:27:06 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/?p=236</guid>
		<description><![CDATA[ Lost the instructions once, never again.All the settings seem to go through the start/stop button.  If you hold it down for 3 (not 2, not 4, but 3) seconds, it toggles in and out of &#8220;set the watch mode&#8221;.  You can tell you are in it because the seconds at the bottom [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=236&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p> Lost the instructions once, never again.<span id="more-236"></span>All the settings seem to go through the start/stop button.  If you hold it down for 3 (not 2, not 4, but 3) seconds, it toggles in and out of &#8220;set the watch mode&#8221;.  You can tell you are in it because the seconds at the bottom go all blinky.  Use (quick press) start/stop to move from seconds, to minutes, to hours, to year, to month, to day.  Mode subtracts, reset adds.</p>
<p>To set alarms, etc, first put the watch into Alarm Mode (Mode button, again).<br />
Use the reset button to move to the selected alarm (1-5).<br />
Hold the start/stop button for 3 seconds to toggle into &#8220;set the alarm mode&#8221;.<br />
Quick press of start/stop moves between things to set (kind of alarm, hours, minutes).<br />
Mode subtracts, reset adds.<br />
3 second hold of start/stop takes you out of setting mode.</p>
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		<title>More undercabinet lights</title>
		<link>http://dr2chase.wordpress.com/2008/10/19/more-undercabinet-lights/</link>
		<comments>http://dr2chase.wordpress.com/2008/10/19/more-undercabinet-lights/#comments</comments>
		<pubDate>Sun, 19 Oct 2008 23:43:50 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/?p=199</guid>
		<description><![CDATA[I saw an article in today&#8217;s Boston Globe on wind power at Block Island.  They pay 65 cents per kilowatt hour there.  We pay 17, and I thought that was high.  Seems like these guys would be likely customers for efficient lights.In the last year or so, the LED manufacturers turned the [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=199&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p>I saw an article in today&#8217;s Boston Globe on <a href="http://www.boston.com/lifestyle/green/articles/2008/10/19/block_island_embracing_offshore_wind_farm_plan/">wind power at Block Island</a>.  They pay 65 cents per kilowatt hour there.  We pay 17, and I thought that was high.  Seems like these guys would be likely customers for efficient lights.<span id="more-199"></span>In the last year or so, the LED manufacturers turned the crank again, and the new LEDs, available in quantity one over the web, are unambiguously more efficient than fluorescent bulbs (technically speaking, white LEDs are also fluorescent).  Our old undercabinet lights were halogen, hot, inefficient, and a pain to replace when they burned out.</p>
<p>The most efficent LEDs, unfortunately, look too blue, but when the selection at <a href="http://www.ledsupply.com">my favorite LED supply company</a> included <a href="http://www.ledsupply.com/creexre-nw.php">new &#8220;neutral white&#8221; CREE LEDs</a>, I decided it was time to make the switch.</p>
<p>I bought 10, using one for a battery-powered helmet light, leaving nine to be run from <a href="http://www.ledsupply.com/ld-mdu9-sc-3570.php">a LED regulator</a>.  My steps to manufacture the mounted lights were:</p>
<ol>
<li>Solder leads onto star-mounted LEDs.  Do this first, because it is easier to solder before it is mounted on the heatsink, and you won&#8217;t overheat the epoxy.  Use lead-free solder, because you&#8217;re putting it into a kitchen, ok?</li>
<li>Cut aluminum flat stock into pieces.</li>
<li>Drill 2 holes per aluminum piece for screw mounts on diagonally opposing corners.</li>
<li>Glue stand-offs onto back of aluminum pieces (on corners of other diagonal).  The stand-offs ensure that the there is some air behind the aluminum plates for convection.</li>
<li>Glue the LED to the aluminum plate, with epoxy or thermal epoxy, using two strong clamps on two sides of the &#8220;star&#8221; to squash the glue down as thing as possible.</li>
<li>Screw the aluminum plates to the underside of the cabinet, taking care not to tighten the screws any tighter than snug &#8212; otherwise the plate will flex and pop the LED loose.  If you do, either redo the epoxy, or just tack it back up with non-gel superglue (you want the thinnest possible layer of glue).</li>
<li>Trim and solder the leads together, all in series.</li>
</ol>
<p>This is sort of what it looks like under the cabinet.  The red wire in the pair is connected to the series-connected LEDs (4 shown here), the black wire in the pair is the return.  All the connections are soldered, the current is .35 A, the maximum voltage across the pair at any point is 28 V (limit of the power supply, and also of 9 3 volt LEDs in series).  It is worth noting that these LEDs could run as much as .7A, but the light does not scale up proportionately, and the increased heat might require a less casual approach to heat-sinking.<br />
<br />
<a href="http://gallery.me.com/dr2chase/100082/IMG_0484/web.jpg"><img src="http://gallery.me.com/dr2chase/100082/IMG_0484/web.jpg" width="500"></a><br />
This is what it looks like, cloudy day, other lights off.  It&#8217;s a completely adequate light, and the power meter says it&#8217;s pulling 11 watts (the power factor is 60, but compact fluorescents are no better &#8212; I checked).<br />
<a href="http://gallery.me.com/dr2chase/100082/IMG_0495/web.jpg"><img src="http://gallery.me.com/dr2chase/100082/IMG_0495/web.jpg" width="500"></a><br />
Asuming I did the heat sinks right and there&#8217;s enough air movement, those lights should be good for 50,000 hours of run-time.</p>
<p>And no, it&#8217;s not cheap &#8212; each LED cost $8.50, and the power supply was $31.50.  However, undercabinet lights tend to be pricey, and are often inefficient, and even then they frequently look like crap.  This is the killer app for LEDs &#8212; they have a great low profile, are not at too much of a price disadvantage, the low voltage/no glass/no mercury is a good thing in a kitchen.  A true safety weenie would cover the exposed solder pads with a little epoxy or nail polish, and run the whole thing off a GFI protected circuit.</p>
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		<title>Reference material</title>
		<link>http://dr2chase.wordpress.com/2008/06/13/reference-material/</link>
		<comments>http://dr2chase.wordpress.com/2008/06/13/reference-material/#comments</comments>
		<pubDate>Sat, 14 Jun 2008 01:28:53 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>
		<category><![CDATA[Politics]]></category>
		<category><![CDATA[Useful]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/?p=184</guid>
		<description><![CDATA[Useful websites for figuring stuff out


State bicycle laws (includes many state vehicle code pointers): http://www.massbike.org/bikelaw/statelaws.htm
Massachusetts Education Reform Laws: http://www.doe.mass.edu/lawsregs/603cmr10.html?section=06
Massachusetts Municpal Actual Revenues and Expenditures
Many statistics comparing countries: http://www.nationmaster.com/index.php
and states: http://www.statemaster.com/index.php
Demographic data by zipcode: http://www.zipskinny.com/
MCAS results: http://www.boston.com/news/education/k_12/mcas/
Mass.gov Belmont page: http://www.mass.gov/?pageID=mg2localgovccpage&#38;L=1&#38;L0=home&#38;L1=Resident&#38;sid=massgov2&#38;selectCity=Belmont
Educational profiles (Mass): http://profiles.doe.mass.edu/
Inflation data: http://www.minneapolisfed.org/community_education/teacher/calc/hist1800.cfm
Income dispersion:
Income Inequality (1947-1998)
Historical Income Inequality Tables 
     [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=184&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p><strong>Useful websites for figuring stuff out<br />
</strong></p>
<p><span id="more-184"></span><br />
State bicycle laws (includes many state vehicle code pointers): <a href="http://www.massbike.org/bikelaw/statelaws.htm">http://www.massbike.org/bikelaw/statelaws.htm</a></p>
<p>Massachusetts Education Reform Laws: <a href="http://www.doe.mass.edu/lawsregs/603cmr10.html?section=06">http://www.doe.mass.edu/lawsregs/603cmr10.html?section=06</a></p>
<p><a href="http://www.mass.gov/?pageID=dorterminal&amp;L=4&amp;L0=Home&amp;L1=Local+Officials&amp;L2=Municipal+Data+and+Financial+Management&amp;L3=Data+Bank+Reports&amp;sid=Ador&amp;b=terminalcontent&amp;f=dls_mdmstuf_munactexp&amp;csid=Ador">Massachusetts Municpal Actual Revenues and Expenditures</a></p>
<p>Many statistics comparing countries: <a href="http://www.nationmaster.com/index.php">http://www.nationmaster.com/index.php</a></p>
<p>and states: <a href="http://www.statemaster.com/index.php">http://www.statemaster.com/index.php</a></p>
<p>Demographic data by zipcode: <a href="http://www.zipskinny.com/">http://www.zipskinny.com/</a></p>
<p>MCAS results: <a href="http://www.boston.com/news/education/k_12/mcas/">http://www.boston.com/news/education/k_12/mcas/</a></p>
<p>Mass.gov Belmont page: <a href="http://www.mass.gov/?pageID=mg2localgovccpage&amp;L=1&amp;L0=home&amp;L1=Resident&amp;sid=massgov2&amp;selectCity=Belmont">http://www.mass.gov/?pageID=mg2localgovccpage&amp;L=1&amp;L0=home&amp;L1=Resident&amp;sid=massgov2&amp;selectCity=Belmont</a></p>
<p>Educational profiles (Mass): <a href="http://profiles.doe.mass.edu/">http://profiles.doe.mass.edu/</a></p>
<p>Inflation data: <a href="http://www.minneapolisfed.org/community_education/teacher/calc/hist1800.cfm">http://www.minneapolisfed.org/community_education/teacher/calc/hist1800.cfm</a></p>
<p>Income dispersion:<br />
<a href="http://www.census.gov/hhes/www/income/incineq/p60204.html">Income Inequality (1947-1998)</a><br />
<a href="http://www.census.gov/hhes/www/income/histinc/ineqtoc.html">Historical Income Inequality Tables</a> </p>
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		<title>Spectrum, LED vs fluorescent</title>
		<link>http://dr2chase.wordpress.com/2008/05/08/spectrum-led-vs-fluorescent/</link>
		<comments>http://dr2chase.wordpress.com/2008/05/08/spectrum-led-vs-fluorescent/#comments</comments>
		<pubDate>Thu, 08 May 2008 04:40:21 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
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		<guid isPermaLink="false">http://dr2chase.wordpress.com/?p=181</guid>
		<description><![CDATA[If you ever wondered why things look &#8220;wrong&#8221; under fluorescent light, this is why.
Carpooling to Vermont with a physicist, he explained what I had already once seen with my own eyes, which is that fluorescent lights dump all their energy into a handful of colors.  Not around a handful of colors, but exactly on [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=181&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p>If you ever wondered why things look &#8220;wrong&#8221; under fluorescent light, this is why.<span id="more-181"></span><br />
Carpooling to Vermont with a physicist, he explained what I had already once seen with my own eyes, which is that fluorescent lights dump all their energy into a handful of colors.  Not around a handful of colors, but exactly on a handful of colors.  You can see this yourself with a diffraction grating (one can be found in the Klutz Exploratorium book).  White LEDs, in contrast, emit a smear of colors closer to what we expect from a traditional light bulb (but with much less infrared, also known as &#8220;heat&#8221;).</p>
<p>Compare these two lights.  The first is a halogen light in a ceiling flood.<br />
Notice how the colors (the spectrum) are a continuous smear.</p>
<p><img src="http://gallery.mac.com/dr2chase/100082/IMG_3480/web.jpg" width="500"></p>
<p>The second is a compact fluorescent in a ceiling flood.<br />
Notice how the colors appear as distinct, separated images of the flood light.<br />
The light is only producing exactly those six or seven colors that you can see there,<br />
and nothing in betweeen.  When you illuminate something with that light, it&#8217;s no wonder<br />
that it looks a little peculiar.</p>
<p><img src="http://gallery.mac.com/dr2chase/100082/IMG_3484/web.jpg" width="500"></p>
<p>Here&#8217;s the spectrum from a (bright white, I think) LED strip light.<br />
Notice how the colors are more or less continuous; not quite as good as the halogen,<br />
but close:</p>
<p><img src="http://gallery.mac.com/dr2chase/100082/IMG_3482/web.jpg" width="500"></p>
<p>By combining white LEDs of different color temperatures, you can get a good distribution of colors.</p>
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		<title>Food and Energy</title>
		<link>http://dr2chase.wordpress.com/2008/04/12/food-and-energy/</link>
		<comments>http://dr2chase.wordpress.com/2008/04/12/food-and-energy/#comments</comments>
		<pubDate>Sat, 12 Apr 2008 21:46:31 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd (and bike) stuff]]></category>
		<category><![CDATA[Nerd stuff]]></category>
		<category><![CDATA[Politics]]></category>
		<category><![CDATA[Useful]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/?p=179</guid>
		<description><![CDATA[People have studied how much energy it takes to produce food.  It&#8217;s interesting.  You should read about this, too.The definitive book to read seems to be Food, Energy and Society, edited by D. Pimentel and M. Pimentel, published in 1996.  They studied the energy cost of obtaining food in many, many different [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=179&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p>People have studied how much energy it takes to produce food.  It&#8217;s interesting.  You should read about this, too.<span id="more-179"></span>The definitive book to read seems to be <em>Food, Energy and Society</em>, edited by D. Pimentel and M. Pimentel, published in 1996.  They studied the energy cost of obtaining food in many, many different ways.  The main result is that high-productivity farming (like the kind we practice in the US) uses a boatload of energy.  Converting grain into meat by feeding it to mammals (cattle, pigs, sheep) uses many calories of grain to create one calorie of meat, so meat is even less energy-efficient.  There&#8217;s a huge amount of information in this book, much of it interesting, some of it depressing.  It will make you want to tear your hair out every time you hear someone talking about farming fuels; odds are, it just won&#8217;t work.  Besides the fertilizer inputs, there&#8217;s also water, and the fertility of the soil.  (People need to get serious about driving less, and driving much smaller cars, and they need to do this as soon as possible.)</p>
<p><a href="http://geosci.uchicago.edu/~gidon/papers/nutri/nutri.html">This paper</a> (which is more quickly accessed) builds on this to demonstrate just how much energy this is, and also studies the greenhouse gas effects (which are not 100% correlated with energy).  Animals, and their manure, produce both methane and nitrous oxides.  The difference in greenhouse gas emissions between a meat-heavy diet (generally, a typical US diet), and either a vegetarian, or poultry-light diet, can be as large as the difference between driving an SUV and driving a Prius.</p>
<p>It&#8217;s also interesting, and depressing, to study the behavior of what I can only call energy-gluttony-apologists.  If we cannot get more people to understand what is (probably) going on, we are so screwed.  Even one meter of sea level rise will do a lot of damage to coastal cities all around the country, never mind other countries.  It&#8217;ll mess up drainage and mess up water tables, even if it doesn&#8217;t directly flood property.</p>
<p>What I find most incredible is the notion that we simply cannot cut back; that no car can have fewer than 100 horsepower (I learned to drive in a 45 HP car, a Saab 96 with a filthy 2-stroke engine); that our cars must be gigantic; that bicycling is not an option; that every meal must have meat.  The stories that people construct in their head to justify not changing their behavior are ludicrous &#8212; somehow, amoral, profit-seeking corporations (the oil industry, the coal industry, the big ag business, and the auto industry) are giving us the straight talk, but people who spent years in school learning how to study experiments, data, and phenomena to figure out what&#8217;s going on &#8212; we&#8217;re all Bond villains, or something, intent on imposing our diabolical will on the world.  Is it perhaps possible that these profit-seeking corporations are being every bit as deceptive and mendacious as the tobacco industry was?  It sure seems that way to me.  Seems to me that the Bond villains were on the good side of that issue, at least all the ones that weren&#8217;t in the employ of the tobacco industry.</p>
<p>And sure, energy gluttony is fun, but given how we produce energy now, it&#8217;s got costs.  We&#8217;ve got to move our asses, right now, and cut back on some of our most-ridiculous overconsumption.  Freezing in the dark is no fun, but driving a Civic instead of a HumVee, that is not much of a sacrifice.  Chicken, instead of beef, is not much of a sacrifice.  Cutting meat portions in half, is not much of a sacrifice.  If you can afford to replace your old crappy leaky windows with new ones, that&#8217;s costly, but new windows are actually nicer.  <a href="http://dr2chase.wordpress.com/2007/11/17/led-under-cabinet-lights/">LED under-cabinet lighting</a> is expensive, but you get a good light, it takes up no space, lasts a dozen or so years in ordinary use (7+ years if run continuously) you get your choice of (and can mix and match) color temperatures, and it doesn&#8217;t get fire-starting hot like halogens and incandescents.  That&#8217;s not a sacrifice.  Places where there&#8217;s lots of sun and not much freezing weather, should move to install solar hot water heaters, right now.  In southern states that is low-hanging fruit.</p>
<p>Riding your bike a few dozen miles per week may sound like a sacrifice to people who have never done it, but it will help you live longer, and live healthier.  I&#8217;ve tried dieting to keep weight off, and THAT is a sacrifice.  Biking, I lost 20 pounds, and it stayed off.  If I don&#8217;t bike, something goes wrong with one of my knees, and the doctors I discussed this with suggested that if I didn&#8217;t like surgery, perhaps I should keep on biking.  Surgery, that&#8217;s a sacrifice.</p>
<p><a href="http://www.organicconsumers.org/FactSheets/biofuels.pdf">More on this.<br />
</a> </p>
<p><a href="http://www.ncga.com/public_policy/issues/2001/ethanol/08_22_01b.htm">And from the National Corn Growers Association.<br />
</a></p>
<p><a href="http://www.thesocialcontract.com/artman2/publish/tsc1204/article_1090.shtml">Two</a> <a href="http://www.jstor.org/pss/1307452">more</a> from Pimental, including the alarming/surprising estimate that we consume more energy than plants create from sunlight.</p>
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		<title>If you&#8217;re a basic cable subscriber, you should get a digital TV converter instead</title>
		<link>http://dr2chase.wordpress.com/2008/03/15/if-youre-a-basic-cable-subscriber-you-should-get-a-digital-tv-converter-instead/</link>
		<comments>http://dr2chase.wordpress.com/2008/03/15/if-youre-a-basic-cable-subscriber-you-should-get-a-digital-tv-converter-instead/#comments</comments>
		<pubDate>Sat, 15 Mar 2008 04:15:53 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/?p=178</guid>
		<description><![CDATA[I read somewhere (New York Times?) that broadcast HDTV, converted to old 3:4 TV format, is very crisp and clear.

In fact, it is.  I wasn&#8217;t too optimistic because we live in a sort of a bowl, and analog TV reception was never that good.  But Circuit City was gung-ho with their return-it-if-it-doesn&#8217;t-work, so [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=178&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p>I read somewhere (New York Times?) that broadcast HDTV, converted to old 3:4 TV format, is very crisp and clear.<br />
<span id="more-178"></span></p>
<p>In fact, it is.  I wasn&#8217;t too optimistic because we live in a sort of a bowl, and analog TV reception was never that good.  But Circuit City was gung-ho with their return-it-if-it-doesn&#8217;t-work, so I gave it a try.  I bought a cheap ($10, just an expensive wire) UHF antenna, and used <a href="http://www.antennaweb.org/aw/welcome.aspx">AntennaWeb</a> to figure out how to align it.  And hey, it worked.  We get WGBH in old-style and letter-box format, we get all the other TV stations that we don&#8217;t watch, and we get WGBX in about 4 different flavors (World, Create, Kids, and regular).</p>
<p>The alignment and obscuring of the antenna do matter; if I stick my hand in front of it, I get badness on the screen.</p>
<p>Additional information: not only do we live in a bowl, we are also in the footprint of a 50 KW AM radio station, which tends to get into everything, but the digital signal still works well.</p>
<p>Before you buy one of those converters, you should request your (<a href="http://dtvfacts.com/converter-box-coupons/">one or two</a>) <a href="https://www.dtv2009.gov/">vouchers</a>.  It takes a while to get them, the program may run out of money, you may need to certify that you do not have cable.  It takes a while to receive them, too.  So, you may need to buy from someone who will take the voucher later, you may need to do without cable for a while.</p>
<p>The converter we bought is a Zenith DTT900, and it worked as well for us <a href="http://www.hdtvexpert.com/pages_b/Zenith_DTT900%20.html">as this review claims</a>.</p>
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		<title>Clever Verizon</title>
		<link>http://dr2chase.wordpress.com/2008/03/14/clever-verizon/</link>
		<comments>http://dr2chase.wordpress.com/2008/03/14/clever-verizon/#comments</comments>
		<pubDate>Sat, 15 Mar 2008 03:18:25 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>
		<category><![CDATA[Politics]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/?p=177</guid>
		<description><![CDATA[I read that Verizon is looking into enhancing P2P, not fighting it.  Smart guys.

Verizon wins for at least three reasons.  By embracing P2P, and promoting services that use it, they will create a demand for a product that Comcast cannot match without spending a bit of money to upgrade their last miles.  [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=177&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p>I read that <a href="http://news.wired.com/dynamic/stories/P/P2P_VERIZON?SITE=WIRE&amp;SECTION=HOME&amp;TEMPLATE=DEFAULT&amp;CTIME=2008-03-14-07-34-23">Verizon</a> is looking into enhancing P2P, not fighting it.  Smart guys.<br />
<span id="more-177"></span><br />
Verizon wins for at least three reasons.  By embracing P2P, and promoting services that use it, they will create a demand for a product that Comcast cannot match without spending a bit of money to upgrade their last miles.  As long as cable users share coax and bandwidth, there are limits to how many P2P users Comcast can support before they run into (local) bottlenecks.  This is one reason they&#8217;ve been throttling P2P file sharing.</p>
<p>Reason number two is probably a little less popular with the propellerhead crowd.  Cable internet providers who throttle P2P bandwidth have driven the P2P users to deploy encryption to make their connections harder to recognize.  This cannot make the spooks happy; back when I ran filesharing, I uploaded a terabyte of data, and about a third of that was (RC160, I think) encrypted.  The NSA has many computers, but there are limits, and if everyone is making encrypted connections, that is going to obfuscate traffic analysis of encrypted connections.  (It is my assumption that the NSA and FBI do have a legitimate need for some wiretaps, and that there are Bad Guys out there that I do want them listening to.  Once they&#8217;ve got their warrant, I&#8217;d prefer that they be able to do their job.)  By embracing P2P, Verizon reduces the urge to encrypt.  There&#8217;s other caching tricks that providers like Verizon can use, if connections are not encrypted, that are somewhat better for everyone.</p>
<p>Reason number three is their trick for tending to localize connections and to provide bandwidth incentives to their customers.  Again, this has got to make the spooks happier.  When I uploaded my terabyte, I sent bits (often encrypted) all over the world.  The more traffic is localized, the less likely I am to ship bits internationally, the smaller the haystack within which the NSA must search for its needles.</p>
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		<title>Ringtones, again</title>
		<link>http://dr2chase.wordpress.com/2007/09/17/ringtones-again/</link>
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		<pubDate>Tue, 18 Sep 2007 00:37:43 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

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		<description><![CDATA[What&#8217;s fairly used in your (i)phone?

After all this hoo-rah about the iPhone, iTunes, and paying for ringtones (is it really not possible to just treat it like an ordinary GSM phone?) I got to thinking about what was in my phone, and what needed to be there.
Music, such as it is:

Alice&#8217;s Restaurant Massacree (intro guitar)
Fish [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=124&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p>What&#8217;s fairly used in your (i)phone?<br />
<span id="more-124"></span><br />
After all this hoo-rah about the iPhone, iTunes, and paying for ringtones (is it really not possible to just treat it like an ordinary GSM phone?) I got to thinking about what was in my phone, and what needed to be there.</p>
<p>Music, such as it is:</p>
<dl>
<dt>Alice&#8217;s Restaurant Massacree (intro guitar)</dt>
<dt>Fish Heads (intro falsetto)</dt>
<p>Eat them up, yum!</p>
<dt>Institutionalized (intro drums)</dt>
<dt>Non-alignment Pact (intro squeal)</dt>
<dd>REALLY ANNOYING.  After you finish trying to figure out where the alarm is, you realize it&#8217;s your phone.</dd>
<dt>Perpetuum Mobile (intro piano)</dt>
<dd>Probably the least-offensive ringtone of the bunch</dd>
<dt>We Have the Technology (outro)</dt>
</dl>
<p>Sounds:</p>
<dl>
<dt>Appel-1</dt>
<dd>My son wanted some phone-sounding ringtones, I found this</dd>
<dt>Dean Scream</dt>
<dt>Long Raspberry</dt>
<dt>Viola Chords</dt>
</dl>
<p>Birds:</p>
<dl>
<dt>American Crow</dt>
<dt>Bobwhite</dt>
<dd>For Dick Cheney (bang!)</dd>
<dt>Chuck Will&#8217;s Widow</dt>
<dt>Laughing Gull</dt>
<dd>Mine! Mine! Mine!</dd>
<dt>Red-Bellied Woodpecker</dt>
<dd>I grew up with these in Florida, didn&#8217;t know who was making the sound at the time (there&#8217;s lots of bugs and frogs and birds in Florida, it could have been a lot of things)</dd>
<dt>Red-Shouldered Hawk</dt>
<dd></dd>
<dt>Red-Winged Blackbird</dt>
<dd>Can&#8217;t use this outdoors near water, too easy to hear a real one and get confused</dd>
</dl>
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		<title>Dr. Who</title>
		<link>http://dr2chase.wordpress.com/2007/08/26/dr-who/</link>
		<comments>http://dr2chase.wordpress.com/2007/08/26/dr-who/#comments</comments>
		<pubDate>Sun, 26 Aug 2007 04:13:53 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>
		<category><![CDATA[Politics]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/2007/08/26/dr-who/</guid>
		<description><![CDATA[&#8220;Lots to do! Beat the Germans! Save the world! Don&#8217;t forget the welfare state!&#8221;
The Doctor (&#8220;The Doctor Dances&#8221;, Doctor Who, Season 27, Episode 10)

So, everyone but me and Max are out of town, it&#8217;s hot, hot, hot (the high was 97, and we went bike riding in it), we decided to watch another disk of [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=119&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p>&#8220;Lots to do! Beat the Germans! Save the world! Don&#8217;t forget the welfare state!&#8221;<br />
The Doctor (&#8220;The Doctor Dances&#8221;, Doctor Who, Season 27, Episode 10)<br />
<span id="more-119"></span><br />
So, everyone but me and Max are out of town, it&#8217;s hot, hot, hot (the high was 97, and we went bike riding in it), we decided to watch another disk of Futurama (Max&#8217;s birthday present).  Disk was done, I was still feeling useless, so I clicked through the channels, and lo, it was Dr. Who.</p>
<p>And in this episode, set mostly in London(?) in WW2, &#8220;everybody lives&#8221;, and as Dr. Who is saying goodbye to a bunch of puzzled people, he says &#8220;Lots to do! Beat the Germans! Save the world! Don&#8217;t forget the welfare state!&#8221;</p>
<p>And I thought that was just wonderful.</p>
<p>What&#8217;s best, is when I went Googling to see if I had heard right, I got 6 hits, and the first one I chose (with the best-looking excerpt), was a bunch of humorless Ayn Rand Objectivists, dedicated to their bone-headed philosophy.  By trying very hard, they didn&#8217;t get it.  Thanks guys, you made my day, and I think your hero is a loony-bird.</p>
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		<title>Trying to design a bike light</title>
		<link>http://dr2chase.wordpress.com/2006/11/12/trying-to-design-a-bike-light/</link>
		<comments>http://dr2chase.wordpress.com/2006/11/12/trying-to-design-a-bike-light/#comments</comments>
		<pubDate>Sun, 12 Nov 2006 15:07:47 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/2006/11/12/trying-to-design-a-bike-light/</guid>
		<description><![CDATA[Once upon a time, we were happy to power a 3 watt generator; now, we make do with 80 milliwatt LEDs.

I&#8217;ve got some old leftover bicycle alternators (&#8220;generators&#8221;) that can crank out about a half amp at 6 volts, alternating. I&#8217;ve got an expensive LED bike light, but for all its brightness, it doesn&#8217;t give [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=85&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><div><font face="Helvetica">Once upon a time, we were happy to power a 3 watt generator; now, we make do with 80 milliwatt LEDs.</font></div>
<p><span id="more-85"></span></p>
<div><font face="Helvetica">I&#8217;ve got some old leftover bicycle alternators (&#8220;generators&#8221;) that can crank out about a half amp at 6 volts, alternating. I&#8217;ve got an expensive LED bike light, but for all its brightness, it doesn&#8217;t give me enough light to see road hazards.  LEDs are only about 60-80 milliwatts, depending on color.  Seems to me that with an old generator, a little EE work, and a lot of LEDs, I could put together a vastly brighter bike light.</font></p>
<p><font face="Helvetica">I&#8217;ve been reading a lot about LEDs, power supplies, components, and the response of the human eye to light. For my purposes, the following things seem to be true about LEDs:</font></div>
<div><font face="Helvetica">	 ?	 blue, or blueish, light is not the best choice.  This is because we don&#8217;t focus well on blue light.</font></div>
<div><font face="Helvetica">	 ?	 red light is not the best choice.  This is because it is intended to be a front light, and because (while commuting) streetlights and oncoming traffic will ensure that my night vision is not well adapted, so I&#8217;ll get no benefit from the preserved color vision.</font></div>
<div><font face="Helvetica">	 ?	 white LEDs vary, a lot.  Some of them have a spectrum with blue spikes in it, some do not.  I am very interested in the <a href="http://www.ledtronics.com/ds/l200cw6kb/" target="NewWindow">3000K color temperature &#8220;warm white&#8221; LEDs from LEDTronics</a> , because they have only a tiny blue spike, peak at 565nm, and deliver the bulk of their light as &#8220;yellow&#8221;.</font></div>
<div><font face="Helvetica">	 ?	 white LEDs have one disadvantage; they do fade a bit after 1000 hours of use.  However, in practice it appears that I would only want to ride in the dark four months per year, or 126 days, or 18 weeks, two hours per week.  That&#8217;s 36 hours per year, which gives a more than adequate efficient bulb life (the bulbs also last longer when run in the cold, which correlates nicely with the darker months).</font></div>
<div><font face="Helvetica">	 ?	 green LEDs are another choice.  For reasons that are unclear, to me, some of these LEDs are incredibly efficient, and also put all their energy into spectrum that we can easily see and focus on. For example, 25000 mcd @ 3V , versus 14000 @3.2V (both with a 16-degree beam). However, I am a little worried about confusing drivers with a green light, and the green LEDs are 40% more expensive.</font></p>
<p><font face="Helvetica">I am stuck on the power supply issue.  It seems to be a standard that the lights should come on at 5.5mph.  I need to calibrate the power output of my little generators to see how much they produce at that speed.  My old generators are clearly unregulated; I cooked a few headlights coming down hills years ago.  LEDs are much less tolerant of over-voltage.  So I need a regulator.  There are several designs that I am considering.</font></p>
<p><font face="Helvetica">One is a straight current-source regulator, out of EE textbooks, probably built using a power MOSFET so that I can make the turn-on voltage as low as possible.  This has the disadvantage of pulling a constant current from the generator, no matter what the voltage.  At high speeds, I would not only be dumping some number of watts into the MOSFET, I would be taxing my own self to do it.</font></p>
<p><font face="Helvetica">A second choice is a switching power supply.  The <a href="http://www.national.com/ds/LM/LM3478.pdf" target="NewWindow">National Semiconductor LM3478</a>  looks like a good choice, and they have lots of design notes at their site.  I&#8217;m particularly interested in the SEPIC designs, because they can take a high or low input voltage and regulate it to a constant output.  There are four sources of power loss here.  One is in the switching diode, which will consume 0.5 volts.  The second is in the current sense resistor, which will probably consume 0.1 volts. Switching losses in the MOSFET are at high frequencies.  Resistive losses in the power supply during the charging duty cycle also contribute.</font></p>
<p><font face="Helvetica">A third choice is a cheesy variant on a switching power supply.  This would simply use the input voltage to charge a capacitor, and use a MOSFET to gate current into the capacitor, based on current feedback.  The inefficiencies here are resistive losses in the MOSFET, resistive losses in the current sense resistor, and resistive losses in the MOSFET during switching.</font></p>
<p><font face="Helvetica">A fourth choice is not to conserve excess power, but instead to dump it into additional lights.  When riding fast, I want as much light as possible, and that could well be more than the light supplied at lower speeds.  One easy way to do this to set up multiple simple-switching power supplies for larger and larger stacks of LEDs, run in parallel, and to gate the MOSFETS from the overall input voltage.</font></p>
<p><font face="Helvetica">One thing I did learn &#8212; Schottky diodes are probably my friend.  I can save 0.2 V, or 28%, on my forward voltage drop over silicon (if I could find a power Ge diode, that might be even better).</font></p>
<p><font face="Helvetica">The fourth choice is looking pretty good, except that my transistor design skills are stale, and my FET design skills are really stale.</font></div>
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		<title>The guys at xtracycle are sharp</title>
		<link>http://dr2chase.wordpress.com/2006/11/01/the-guys-at-xtracycle-are-sharp/</link>
		<comments>http://dr2chase.wordpress.com/2006/11/01/the-guys-at-xtracycle-are-sharp/#comments</comments>
		<pubDate>Wed, 01 Nov 2006 21:02:06 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/2006/11/01/the-guys-at-xtracycle-are-sharp/</guid>
		<description><![CDATA[It works, and people notice it, and like
it.

So, about a month ago I got an XtraCycle.  It works very well.  Empty, I don&#8217;t really notice it is there.  Not-empty, it can carry bags of groceries, a pumpkin, a stupidly heavy backpack, spare clothes, a lock, a half-dozen stretchy cords I found along [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=84&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><div><font face="Helvetica">It works, and people notice it, and like<br />
it.</font></div>
<p><span id="more-84"></span></p>
<div><font face="Helvetica">So, about a month ago I got an XtraCycle.  It works very well.  Empty, I don&#8217;t really notice it is there.  Not-empty, it can carry bags of groceries, a pumpkin, a stupidly heavy backpack, spare clothes, a lock, a half-dozen stretchy cords I found along the road today, a spare tire, and (almost always) a serious toolkit.  I&#8217;ve lost weight, blood pressure&#8217;s better, blood chemistry is better.  I&#8217;m not a big planner or careful packer; with the Xtracycle, I just do whatever the heck I want.</font></p>
<p><font face="Helvetica">What&#8217;s especially entertaining is watching how the chain, under load, manages to not quite hit anything as it threads its way through the old frame and the new FreeRadical, no matter which gear I choose.  Someone thought about that.  The various add-ons seem to fit securely, with surprisingly minimal attachment hair.</font></p>
<p><font face="Helvetica">The handling depends on the load, and how it is placed.  No load is great.  On grades, I think it even helps; the front wheel stays down on the way up, and descending a bumpy dirt path it feels less like it might go end-over.  Some load, forward, is fine.  Much load at a moderate speed, is also ok.  A descent down a 5+% grade, with backpack, grocery bag, toolkit, gallon of milk, lock, clothes, and road souvenirs, with a studded tire on front undergoing its break-in, is &#8220;interesting&#8221;.  After a few experimental wobbles, I decided that slowing down would be prudent.  I think the studded tire is part of the picture; it sometimes seemed squirrely without a load.  And definitely, it benefits from a forward load.  Put a lot of weight far back, and the handling gets a good deal worse.</font></p>
<p><font face="Helvetica">What&#8217;s more interesting is that people notice it, and like it.  I&#8217;ve been reviewing papers (which necessarily happens at Peet&#8217;s Lexington; I need the right amount of unimportant ambient noise, and a steady supply of warmed caffeine) with the bike parked out front, and at least three times someone has noticed it and we&#8217;ve talked at length.  A bunch of construction workers saw it today, and made favorable noises.  Some guy in a crosswalk in Harvard Square saw it yesterday, yelled out &#8220;what do you carry in that?&#8221; &#8212; &#8220;whatever I want&#8221; seemed to be the right answer.</font></div>
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		<title>Stupid stupid spammers</title>
		<link>http://dr2chase.wordpress.com/2006/10/14/stupid-stupid-spammers/</link>
		<comments>http://dr2chase.wordpress.com/2006/10/14/stupid-stupid-spammers/#comments</comments>
		<pubDate>Sat, 14 Oct 2006 13:02:06 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/2006/10/14/stupid-stupid-spammers/</guid>
		<description><![CDATA[
I&#8217;ve got way too many email accounts, and three domain names.  One of them, I actually care about, and read mail regularly. Because I run the domain, I also get all the misaddressed mail, too.  That mailbox was simply drowning in spam, until I went and looked at the addressee names.  Almost [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=83&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p><span id="more-83"></span></p>
<div><font face="Helvetica">I&#8217;ve got way too many email accounts, and three domain names.  One of them, I actually care about, and read mail regularly. Because I run the domain, I also get all the misaddressed mail, too.  That mailbox was simply drowning in spam, until I went and looked at the addressee names.  Almost all of the spam was addressed to uucp, sales, accounting, help, home, accounts, billing, root, majordomo, info, advertising, administrator, mail, contact, feedback, postmaster, and webmaster.  Except for the last two (because I am the postmaster and the webmaster) everything sent to those addresses is directly deleted, untouched by human hands.</font></p>
<p><font face="Helvetica">So what the heck is the point? Those addresses are all official or official-ish addresses.  Anyone who sees mail to root, uucp, administrator, etc, is running a node on the internet, and will almost by definition HATE spam, spammers, phishers, and spyware.  These are people who will, at their kindest, do what I did.  Someone who is more motivated will write filters to gather spam signatures from these clearly bogus emails to help automatically filter spam out of other accounts.</font></p>
<p><font face="Helvetica">There are numerous things we could do to more effectively filter spam, but for reasons completely unclear to me, all the big players who could make it happen, do not.  Google?  Yahoo? MSN/Hotmail?  Apple?  Thunderbird?  (Thunderbird must do this already, I&#8217;ll go look).  All these guys could start signing emails by default with hashcash, or a verified PGP id, or with a vendor-supplied certificate that verifies mail from an actual customer  and give a lower spam score to any mail that was properly signed.  As the signatures become more widely adopted, the bias against unsigned mail can be cranked up.</font></div>
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		<title>So, when we run out of oil, how will we get around?</title>
		<link>http://dr2chase.wordpress.com/2006/10/10/so-when-we-run-out-of-oil-how-will-we-get-around/</link>
		<comments>http://dr2chase.wordpress.com/2006/10/10/so-when-we-run-out-of-oil-how-will-we-get-around/#comments</comments>
		<pubDate>Wed, 11 Oct 2006 00:30:56 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

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		<description><![CDATA[On bikes, of course, but would it hurt to have a
little electrical assist?

One of the finer books that I have read is Bicycling Science .  One of the more astonishing things is how little power it takes to move a human at a moderate pace, if you dispense with the 2000 pounds of armor [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=82&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><div><font face="Helvetica">On bikes, of course, but would it hurt to have a<br />
little electrical assist?</font></div>
<p><span id="more-82"></span>
<div><font face="Helvetica">One of the finer books that I have read is <a href="http://mitpress.mit.edu/catalog/item/default.asp?ttype=2&amp;tid=10063" target="NewWindow">Bicycling Science</a> .  One of the more astonishing things is how little power it takes to move a human at a moderate pace, if you dispense with the 2000 pounds of armor that we normally use for transportation. Of course, as engines go, we&#8217;re pretty wimpy, and many people will balk at riding up a serious hill, especially if they are carrying 4 bags of groceries, especially if (for whatever reason) they are not in good physical shape.  If we were serious, we could supply, as part of our infrastructure, an electrical assist.</font></p>
<p><font face="Helvetica">We have similar infrastructure already; overhead wires for electric busses run on the street right next to where I am typing this, and years ago in San Francisco I often took the electric bus to visit my aunt.  The wires for busses are vastly larger than what would be more than adequate for cycling.</font></p>
<p><font face="Helvetica">A run-of-the-mill electric drill puts out as much power (500W) as a world-champion cyclist, so the motor would not be that big a deal.  One problem is passing; with many cyclists on the road, differently loaded, and contributing different amounts of their own power, passing is inevitable.  I thought of a couple of ways of solving this.  If the electrical contacts were arranged in a checkerboard, and the contacts ended in 3 or more pads, at least two of them would always be contributing power.  Here, the contact pads are green circles, and the arrows indicate diodes for providing power (as the bicycle moves, the current on each individual line can be regarded as a gross form of alternating current).</font></p>
<p><img src="http:/homepage.mac.com/dr2chase/WP/Electric%20bike%20assist.jpg" height="405" width="469" alt="" /><br /><font face="Helvetica"> </font></p>
<p><font face="Helvetica"> Or, multiple parallel wires could be used instead, and a contact bar with multiple segments would ensure that at least two were providing power.</font></p>
<p><font face="Helvetica"> <img src="http:/homepage.mac.com/dr2chase/WP/Electric%20Bike%20Wire%20Assist.jpg" height="491" width="497" alt="" /> </font></p>
<p><font face="Helvetica">The cost of the power is not large; if electricity is $.1 per kWH, an hour&#8217;s assist at high power is a nickel&#8217;s worth of electricity.  If this were applied in general, and not just on hills, with no contribution from the rider, that&#8217;s 20-25 miles, or an energy cost of a fraction of a penny per mile.</font></p>
<p><font face="Helvetica">Infrastructure is a much bigger problem.  The checkerboard pattern is probably the wrong choice; wires require much less overall material, and also serve to distribute the power, and we&#8217;ve got lots of practice stringing wires.  It would probably be sensible to put some sort of a covered structure over the wires and roadway. This costs more initially, but adds to the lifetime of the wires, and makes a more comfortable and safer place for cyclists to ride.  Wires have the possible advantage of being easily adapted to carrying multiple phases of AC, rather than just positive and negative DC; the diodes don&#8217;t care.</font></p>
<p><font face="Helvetica">I&#8217;m not really sure what to think about safety; it&#8217;s sort of a compared-to-what issue.  Bikes moving much faster than 15mph are a good deal more vulnerable to headers if stopped quickly using the front brake.  Perhaps people will make greater use of recumbents, or perhaps they will use ABS braking systems (see Bicycling Science for a discussion of one), or perhaps they will use bicycles where more of the weight is moved to the rear (for example, a tandem, or an xtracycle).  Cars are not exactly risk-free, and one of the most frequently voiced impediments to cycling is fear of cars (and to look at all the dents on cars around Boston, and to extrapolate those dents to my body&#8230;.)  </font></div>
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		<title>Not a bad couple of weeks</title>
		<link>http://dr2chase.wordpress.com/2006/10/07/not-a-bad-couple-of-weeks/</link>
		<comments>http://dr2chase.wordpress.com/2006/10/07/not-a-bad-couple-of-weeks/#comments</comments>
		<pubDate>Sat, 07 Oct 2006 13:18:50 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

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		<description><![CDATA[
In no particular order, the paw-paw trees that I planted about ten years ago finally produced some tasty fruit (which I inflicted on friends, family, and colleagues), I got blood test results back showing that bicycle riding really is good for you, I rode my bike to work over a big hill  BOTH WAYS [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=81&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p><span id="more-81"></span></p>
<div><font face="Helvetica">In no particular order, the paw-paw trees that I planted about ten years ago finally produced some tasty fruit (which I inflicted on friends, family, and colleagues), I got blood test results back showing that bicycle riding really is good for you, I <a href="http://www.bikely.com/maps/bike-path/Belmont-Burlington-commute-over-the-hill" target="NewWindow">rode my bike to work over a big hill</a>  BOTH WAYS (100 meters in 2km going, 60m in 1km returning), and I got my xtracycle installed and it worked as well as advertised.  Carried my daughter up a hill on the back, carried her back down with a bale of wood shavings for the guinea pigs.</font></div>
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		<title>Bike mods</title>
		<link>http://dr2chase.wordpress.com/2006/09/30/bike-mods/</link>
		<comments>http://dr2chase.wordpress.com/2006/09/30/bike-mods/#comments</comments>
		<pubDate>Sat, 30 Sep 2006 06:09:03 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

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		<description><![CDATA[Pimp your ride, on the cheap-ish.

I own four bicycles, but mostly I ride just one. Once upon a time it was a Specialized Crossroads Comp, which I bought because it had high pressure (100psi) tires and disk brakes for not too much money.
But, the seat hurt my butt, so I replaced it with something more [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=80&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><div><font face="Helvetica">Pimp your ride, on the cheap-ish.</font></div>
<p><span id="more-80"></span></p>
<div><font face="Helvetica">I own four bicycles, but mostly I ride just one. Once upon a time it was a <a href="http://www.specialized.com/bc/SBCBkModel.jsp?arc=2003&amp;sid=03Crossroads" target="NewWindow">Specialized Crossroads Comp</a>, which I bought because it had high pressure (100psi) tires and disk brakes for not too much money.</font></p>
<p><font face="Helvetica">But, the seat hurt my butt, so I replaced it with something more conventional (which is to say, narrow black and not too padded).  I decided that the shock seatpost, cushy as it was, was not quite long enough (I tend to like my frames on the small side, and as the largest member of the family, this also means that I can recycle my bike easily) and the height lost to the shock could be used to get a little more power.  I had thought it was long enough when I bought it, but I was wrong.  So, I got a longer, non-spring seatpost.</font></p>
<p><font face="Helvetica">I added fenders, because I hate the skunk stripe, and I hate wet feet.  But, the fenders stopped a little soon, so I decided to enhance them:</font></p>
<p><font face="Helvetica"> <img src="http://homepage.mac.com/dr2chase/WP/IMG_1450.jpg" height="541" width="347" alt="" /> </font></p>
<p><font face="Helvetica">Yes, that clear piece of plastic was once part of a 2-liter soda bottle.  I attached it with string (mason&#8217;s line).</font></p>
<p><font face="Helvetica">The handlebars were a total crock, simply could not stand them.  Numb hands inside of three miles, that sucks.  First I replaced them with something flatter, then I cut those off some with a pipe cutter to make the bike skinnier and reduce the angle on my wrists, then I added bar ends, then I chucked all that and got some moustache bars. That helped quite a bit, because it gave me a number of hand positions, including one very like what worked just fine on my old drop handlebars.  This was fine until a 315-mile bike trip in Nova Scotia, and the left side of my left ring finger went numb, for days, with rejuvenated numbness every time I rode again (which was getting to be pretty often).  So, on a hunch, I wrapped them with a second layer of handlebar tape, biased across the first layer.  Very nice, hands much happier.</font></p>
<p><font face="Helvetica"> <img src="http://homepage.mac.com/dr2chase/WP/IMG_1451.jpg" height="461" width="615" alt="" /> </font></p>
<p><font face="Helvetica">This trip in Nova Scotia, I was going to need to carry some stuff, but I did not have any real panniers.  I had ordered an <a href="http://www.xtracycle.com/freeradical-hitchless-trailer-convert-your-bike-p-2.html" target="NewWindow">Xtracycle FreeRadical</a>, but it was not going to come in time, and I didn&#8217;t want to spend a lot of money on stuff I wasn&#8217;t going to use for long.  But, I saw that Topeak was now making a rack for bikes with disk brakes, and bought one of those, and decided to try to just hang a couple of trash cans off the rack.  The first try didn&#8217;t work as well as I wanted, so I added a support string, and that did the trick:</font></p>
<p><font face="Helvetica"> <img src="http://homepage.mac.com/dr2chase/WP/IMG_1140.jpg" height="206" width="312" alt="" /> </font></p>
<p><font face="Helvetica">The upper green string runs from the front of the rack to the back of the rack, and also attaches to the vertical white line that runs under the trash can and attaches to the base of the rack. The lower green string, running diagonally upwards from front to back, wraps around the base of the rack with an elastic band to pull the trash can back away from my heel when pedaling.  Without the trash can, it looks like this:</font></p>
<p><font face="Helvetica"> <img src="http://homepage.mac.com/dr2chase/WP/IMG_1130.jpg" height="406" width="489" alt="" /> </font><br /><font face="Helvetica">The diagonal line is hard to see because the elastic is black; I am holding the upper string out from the bike.  Notice that all the knots are pre-tied; the whole mess is passed through the loop in front, and the pannier has a hookable thing in the back, and all the lower attachments are just loops snagged on rack prongs.</font></p>
<p><font face="Helvetica">(Notice the silvery spokes mixed in with the black?  I break spokes, 1/4 of the spokes in that wheel are replacements.  First time this has ever been a problem for me, one might suspect that the spokes are wimpy.  Beats ripping handlebars in half, which I did twice when I was younger.)</font></p>
<p><font face="Helvetica">Since then, I tried a variety of &#8220;improvements&#8221;, though only one of them worked (notice all the aluminum smears from the rack.  Long term, this might be a problem.)</font></p>
<p><font face="Helvetica"> <img src="http://homepage.mac.com/dr2chase/WP/IMG_1454.jpg" height="392" width="487" alt="" /> </font><br /><font face="Helvetica">The main difference here is that the support strap is now a loop with two attachment points.  I was feeling ambitious, and the anti-heel-kick restraint (blue) is spliced at both ends (had to get the length right, had to remember how to splice), like so:</font></p>
<p><font face="Helvetica"> <img src="http://homepage.mac.com/dr2chase/WP/IMG_1453.jpg" height="436" width="616" alt="" /> </font></p>
<p><font face="Helvetica">The latest mod, and not a cheap one, was converting to an Xtracycle:</font></p>
<p><font face="Helvetica"> <img src="http://homepage.mac.com/dr2chase/WP/IMG_1473.jpg" height="461" width="615" alt="" /> </font></p>
<p><font face="Helvetica">That&#8217;s immediately after installation, in my saw-dusty work area, with the passenger grips attached to the seat post. I rode it to work today, it was pretty nice, though the footies clattered a little bit and I need to figure out a good way to protect the rear disk brake from the fabric next to it, and vice versa.  But, I loaded it up, it handled well, rides fast.  The install was a little rough, I sent suggestions to the Xtracycle people, and I&#8217;ll email tips for avoiding trouble to anyone who asks.</font></p>
</div>
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		<title>Phone Phun</title>
		<link>http://dr2chase.wordpress.com/2006/06/20/phone-phun/</link>
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		<pubDate>Wed, 21 Jun 2006 03:21:42 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/2006/06/20/phone-phun/</guid>
		<description><![CDATA[Why on earth would anyone pay for ring-tones?

I don&#8217;t own a camera phone yet, but I do own a nice enough cheap phone, a Motorola v.188.  It folds (because I destroy things in my pockets &#8212; the exterior display is cracked twice), and it runs for a long time on a charge, and it [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=79&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><div><font face="Helvetica">Why on earth would anyone pay for ring-tones?</font></div>
<p><span id="more-79"></span></p>
<div>I don&#8217;t own a camera phone yet, but I do own a nice enough cheap phone, a Motorola v.188.  It folds (because I destroy things in my pockets &#8212; the exterior display is cracked twice), and it runs for a long time on a charge, and it plays MP3 ringtones and displays 128&#215;128 JPEG and PNG. It has a nice standard USB miniplug, and it does GPRS and lots of GSM bands.  In theory I could use it in most parts of the world, and in theory my provider (T-Mobile) would let me, and only charge me a few joints off my fingers, instead of an arm and a leg.</p>
<p>The new fun thing is that I found an application, <a href="http://www.traud.de/gsm/remote/" target="NewWindow">GSM Remote</a> , that I can pay for just once, that lets me load whatever music and pictures I want to onto the phone.  Before this, I had to upload to a web site, then download onto a phone, and the phone had to have the web-browsing service turned on.  GSM Remote&#8217;s worst bug was that it failed to advertise that it was willing to drag and drop files from my (Mac) desktop to the phone folder window (I think this will get fixed, because I reported my confusion to the author and he very helpfully straightened me out and seemed to indicate that he would fiddle the UI).  So big fun, no need to pay for ringtones, no need to pay for web access, just prepare in <a href="http://audacity.sourceforge.net/" target="NewWindow">Audacity</a> , convert to <a href="http://audacity.sourceforge.net/help/faq?s=install&amp;item=lame-mp3" target="NewWindow">MP3</a> , and upload to phone.  (I assume something similar is available on the PC, but I have no idea what it would be).</p>
<p>Here&#8217;s some noises that I own, that I am happy to share:</p>
<p><a href="http://homepage.mac.com/dr2chase/WP/MicroConchMono.mp3">A horse conch, blown, and kicked up an octave or so in Audacity</a>.  This was recorded on a laptop.</p>
<p><a href="http://homepage.mac.com/dr2chase/WP/Junior.mp3">A red-shouldered hawk, &#8220;Junior&#8221;</a>, at my parent&#8217;s house in Florida.  The funny effect you hear is his echo off their house.  This is a little irritating as a ring-tone, but sometimes irritating is what you want.  This was recorded on a camera.</p>
<p><a href="http://homepage.mac.com/dr2chase/WP/JuniorHalf.mp3">Junior, pitched down an octave</a>.  Sounds somewhat human.</p>
<p><a href="http://homepage.mac.com/dr2chase/WP/JuniorQuarter.mp3">Junior, pitched down two octaves</a>.  Sounds somewhat human, dopplering out of a high window.</p>
<p><a href="http://homepage.mac.com/dr2chase/WP/ViolaChords.mp3">My son, playing some doubled notes on a viola.</a></p>
<p><img src="http://homepage.mac.com/dr2chase/WP/TieDyeSheet.jpg" height="72" width="72" alt="" /><br /> This sheet was prepared for an April Fool&#8217;s joke, and now decorates an office at Sun Microsystems in Burlington.<br /><img src="http://homepage.mac.com/dr2chase/WP/BananaFlower.jpg" height="72" width="72" alt="" /><br /> A banana, with flowers.<br /><img src="http://homepage.mac.com/dr2chase/WP/VolcanoOffering.jpg" height="72" width="72" alt="" /><br /> An offering left at a crater of Kilauea</p>
</div>
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		<title>If you&#8217;re a Quimper pottery nerd</title>
		<link>http://dr2chase.wordpress.com/2005/12/11/if-youre-a-quimper-pottery-nerd/</link>
		<comments>http://dr2chase.wordpress.com/2005/12/11/if-youre-a-quimper-pottery-nerd/#comments</comments>
		<pubDate>Sun, 11 Dec 2005 18:31:04 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/2005/12/11/if-youre-a-quimper-pottery-nerd/</guid>
		<description><![CDATA[Most of the Quimper pottery that you see on the net is junky looking stuff.  This isn&#8217;t.

My great-grandmother traveled in Europe before World War II, and bought some Quimper breakfast plates. She willed them to us as a wedding present.  We&#8217;ve always wondered why they looked different from the stuff that is usually [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=78&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><div><font face="Helvetica">Most of the Quimper pottery that you see on the net is junky looking stuff.  This isn&#8217;t.</font></div>
<p><span id="more-78"></span></p>
<div><font face="Helvetica">My great-grandmother traveled in Europe before World War II, and bought some Quimper breakfast plates. She willed them to us as a wedding present.  We&#8217;ve always wondered why they looked different from the stuff that is usually called Quimper, and couldn&#8217;t even find any on the web.</font></p>
<p><font face="Helvetica">One day, I realized that all six plates had the initials &#8220;MM&#8221; on them, and so I added that to the search. Along with many measurements in millimeters, this turned up the name &#8220;Mathurin Meheut&#8221;.  Searching for &#8220;Quimper Mathurin Meheut&#8221; turned up a <a href="http://www.antiquites-en-france.com/antiquites/5851_assiette-henriot-quimper-mathurin-meheut.html" target="NewWindow">page</a>  (which may go dead if the plate is sold) with this picture on it:</font><br /><img src="http://homepage.mac.com/dr2chase/WP/5851v1b.jpg" height="300" width="400" alt="" /></p>
<p><font face="Helvetica">We don&#8217;t own this plate, though I wish that we did.  It&#8217;s clearly the same style as our plates:</font><br /><img src="http://homepage.mac.com/dr2chase/WP/DSC01732.jpg" height="414" width="452" hspace="0" vspace="0" alt="Quimper plate, Mathurin Meheut art, woman baking a crepe" border="0" /></p>
<p><img src="http://homepage.mac.com/dr2chase/WP/DSC01731.jpg" height="414" width="452" hspace="0" vspace="0" alt="Quimper plate, Mathurin Meheut art, woman milking a cow" border="0" /></p>
<p><img src="http://homepage.mac.com/dr2chase/WP/DSC01730.jpg" height="414" width="443" hspace="0" vspace="0" alt="Quimper plate, Mathurin Meheut art, woman cutting grain" border="0" /></p>
<p><img src="http://homepage.mac.com/dr2chase/WP/DSC01729.jpg" height="414" width="456" hspace="0" vspace="0" alt="Quimper plate, Mathurin Meheut art, woman winnowing grain" border="0" /></p>
<p><img src="http://homepage.mac.com/dr2chase/WP/DSC01728.jpg" height="414" width="467" hspace="0" vspace="0" alt="Quimper plate, Mathurin Meheut art, woman gathering fruit (?)" border="0" /></p>
<p><img src="http://homepage.mac.com/dr2chase/WP/DSC01727.jpg" height="414" width="453" hspace="0" vspace="0" alt="Quimper plate, Mathurin Meheut art, woman taking grain to mill" border="0" /></p>
<p><font face="Helvetica">No, they are not for sale, but I thought that we needed more pictures on the net.</font></div>
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			<media:title type="html">Quimper plate, Mathurin Meheut art, woman baking a crepe</media:title>
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		<media:content url="http://homepage.mac.com/dr2chase/WP/DSC01731.jpg" medium="image">
			<media:title type="html">Quimper plate, Mathurin Meheut art, woman milking a cow</media:title>
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			<media:title type="html">Quimper plate, Mathurin Meheut art, woman cutting grain</media:title>
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			<media:title type="html">Quimper plate, Mathurin Meheut art, woman winnowing grain</media:title>
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			<media:title type="html">Quimper plate, Mathurin Meheut art, woman gathering fruit (?)</media:title>
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			<media:title type="html">Quimper plate, Mathurin Meheut art, woman taking grain to mill</media:title>
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		<title>Art imitating life</title>
		<link>http://dr2chase.wordpress.com/2005/07/28/art-imitating-life/</link>
		<comments>http://dr2chase.wordpress.com/2005/07/28/art-imitating-life/#comments</comments>
		<pubDate>Fri, 29 Jul 2005 02:52:27 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/2005/07/28/art-imitating-life/</guid>
		<description><![CDATA[
A Dean Scream ringtone appear in a recent Prickly City strip.  I&#8217;ve got one of those already. I&#8217;ve got several others that I put together using Audacity and Lame , but I can&#8217;t release all of them.  I do have a child (mine) doing a raspberry, plus two selections from the G-Town Church [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=77&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><p><span id="more-77"></span><br />
A Dean Scream ringtone appear in a <a href="http://www.ucomics.com/pricklycity/2005/07/25/" target="NewWindow">recent Prickly City strip</a>.  I&#8217;ve got <a href="http://homepage.mac.com/dr2chase/WP/DeanScream.mp3">one of those</a> already. I&#8217;ve got several others that I put together using <a href="http://audacity.sourceforge.net" target="NewWindow">Audacity</a> and <a href="http://audacity.sourceforge.net/help/faq?s=install&amp;item=lame-mp3" target="NewWindow">Lame</a> , but I can&#8217;t release all of them.  I do have a <a href="http://homepage.mac.com/dr2chase/WP/LongRaspberry.mp3">child (mine) doing a raspberry</a>, plus <a href="http://homepage.mac.com/dr2chase/WP/waterbowlB.mp3">two</a> <a href="http://homepage.mac.com/dr2chase/WP/waterbowlF.mp3">selections</a> from the G-Town Church Samples (Creative Commons license) . I also had excellent luck ripping and editing some <a href="http://www.birds.cornell.edu/Shop/audioguides.html" target="NewWindow">bird noises</a> , but those are not mine to redistribute.  We should all be choosing our own favorite birds anyhow, otherwise our phones will all sound alike.</p>
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		<title>On recovering from disk failure</title>
		<link>http://dr2chase.wordpress.com/2005/07/28/on-recovering-from-disk-failure/</link>
		<comments>http://dr2chase.wordpress.com/2005/07/28/on-recovering-from-disk-failure/#comments</comments>
		<pubDate>Fri, 29 Jul 2005 02:32:52 +0000</pubDate>
		<dc:creator>dr2chase</dc:creator>
				<category><![CDATA[Nerd stuff]]></category>

		<guid isPermaLink="false">http://dr2chase.wordpress.com/2005/07/28/on-recovering-from-disk-failure/</guid>
		<description><![CDATA[Sometimes, it pays to do things right.  Reformatting a disk is one of those things.

I am on my third disk crash in about a year.  The first one was a total loss; the drive would no longer spin up.  All my knowledgeable friends recommended writing the data off if I did not [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=dr2chase.wordpress.com&blog=1111171&post=76&subd=dr2chase&ref=&feed=1" />]]></description>
			<content:encoded><![CDATA[<div class='snap_preview'><br /><div><font face="Helvetica">Sometimes, it pays to do things right.  Reformatting a disk is one of those things.</font></div>
<p><span id="more-76"></span></p>
<div><font face="Helvetica">I am on my third disk crash in about a year.  The first one was a total loss; the drive would no longer spin up.  All my knowledgeable friends recommended writing the data off if I did not want to spend hundreds or thousands of dollars on drive recovery services (I tried both replacing the outboard PCB, and freezing the disk.  Neither worked, and the old PCB is actually still in use on another disk).</font></p>
<p><font face="Helvetica">Crash number two happened under peculiar circumstances (kids playing games in OS9 compatibility mode, plus behaving badly) so we assumed it was just software.  I had a day-old backup, so we just reformatted and carried on.  However, I made a crucial mistake when I reformatted &#8212; I did not take the time to &#8220;write zeros&#8221; to the new drive.  It turns out that this is a good thing to do, because it allows the formatter to detect bad sectors and replace (remap) them with spares.</font></p>
<p><font face="Helvetica">Crash number three happened a month later.  Now that the dust is clearing, and after much web-searching and data recovery, I managed to figure out roughly what happened.  A very small number of blocks on a 250GB drive were bad;  I think about 1 block in 5,000,000, and they appeared to be clustered.  That means that if the initial restore did not use any of those bad blocks, the machine would appear to work just great, and it would continue to work great as long as nobody wrote vital data to one of those blocks.  One in 5 million is pretty good odds, too, so it&#8217;s no surprise that things looked good for a while.</font></p>
<p><font face="Helvetica">Until, of course, we got unlucky.  Our backup was several days old, and we had unloaded some birthday party pictures, so we really didn&#8217;t want to just scratch it.  I tried DiskWarrior first, but after about 15 hours (actually, more like 25, but a power failure set me back) I decided to give Data Rescue a try.  Data Rescue did not repair the disk, but it did obtain the valuable data for me.  My understanding of the problem is that DiskWarrior would eventually have succeeded, but it gave no feedback about its progress.  Data Rescue had a &#8220;thorough&#8221; option that I tried first; however, after hitting a few bad blocks it started estimating completion times in the 12,000 minute range (i.e., 200 hours) so I tried a quick scan that took about 30 minutes, and found all the missing files.</font></p>
<p><font face="Helvetica">Right now, I am reformatting and writing zeros, in hopes that the result will be a fully functional disk.  If it weren&#8217;t for the hassle, I would have played the AppleCare card and just gotten a replacement drive.</font></div>
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