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From: Doug Ambrisko <ambrisko@whistle.com>
Message-Id: <199802252239.OAA02224@crab.whistle.com>
Subject: Re: New SoftUpdates test kit
In-Reply-To: <19980223083856.65231@rf900.physics.usyd.edu.au> from David Dawes at "Feb 23, 98 08:38:56 am"
To: current@FreeBSD.ORG
Date: Wed, 25 Feb 1998 14:39:34 -0800 (PST)
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David Dawes writes:
| Looking through the logs, I found a few different ones, which might be
| more serious(?):
| 
| wd2: interrupt timeout:
| wd2: status 58<rdy,seekdone,drq> error 1<no_dam>
| 
| wd2: interrupt timeout:
| wd2: status 58<rdy,seekdone,drq> error 60<uncorr,id_crc>

Here's some info on a related problem we've seen here.  A lot of IDE disk
drives do not seem to be low-level formated very well from the manufacturer.
Current IDE drives are "perfect" and do sector remaping when they detect an
error and are writing out new information.  We discovered that many fresh
IDE drives that had data just written to them would have a lot of "bit rot"
on them producing various errors like above.  To reduce this problem we
now do a read & write pass of the entire disk before loading the drive.
Then we do a checksum verification of the load.  By doing this we have
greatly reduced this problem.

I now do this to any drive I use.  Had to reload a 4G laptop drive 
because I skipped this step and it started to suffer "bit rot".
It was not fun to re-load yet again.

Doug A.

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