Hello Andrew :-)

Interesting analysis.

You are correct to write "The OP's report does not have the 'attempt to
access beyond end of device' error message".  That message was not
reported here until
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/228624/comments/14
.  I have seen a bewildering variety of error messages since 23 Nov 08!

By 7 March 09 intermittent read failures (despite the
/etc/hal/fdi/policy/preferences.fdi workaround) had become so frequent I
returned the drive under warranty and fitted a new drive pending
replacement of the first.  I backed out the
/etc/hal/fdi/policy/preferences.fdi workaround and all was well for a
week or so.

Then read failures began again.  Now with a new replacement for the
original drive I am often able to workaround the problem by moving the
media to the other drive; if that doesn't work, cleaning the media often
works; if that doesn't work, new media works (I am backing up to DVD so
the read failures happen during verification and re-writing backup files
to DVD is easy).  In the early days of this problem, rebooting often got
around the problem but that is less convenient now because of some long-
running tasks.

I believe there is more than one bug here because so many different
error messages and workarounds have been given in this report.  The
triggering cause may be deficient error recovery.  The picture may be
complicated by interactions amongst ubuntu components.

I will modify the backup script to log messages from /var/log/kern.log
after a DVD read failure in the hope of building a statistical picture

Best

Charles

-- 
DVD writer not working since hardy upgrade
https://bugs.launchpad.net/bugs/228624
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