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Date: Wed, 04 Feb 2004 11:38:39 +0200
From: Gilad Rom <gilad_bsd@romat.com>
Organization: Romat Telecom
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To: treeml <treeml@itree.org>
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Subject: Re: UDMA ICRC Error FreeBSD 4.9, falling back to PIO mode
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treeml wrote:
> I get a following error on boot
> 
> ad1s1a: UDMA ICRC error reading fsbn 511 of 244-255 (ad1s1 bn 511; cn 0 tn
> 8sn 7) retrying
> ad1s1a: UDMA ICRC error reading fsbn 511 of 244-255 (ad1s1 bn 511; cn 0 tn
> 8sn 7) retrying
> ad1s1a: UDMA ICRC error reading fsbn 511 of 244-255 (ad1s1 bn 511; cn 0 tn
> 8sn 7) retrying
> ad1s1a: UDMA ICRC error reading fsbn 511 of 244-255 (ad1s1 bn 511; cn 0 tn
> 8sn 7) retrying
> falling back to PIO mode
> 

Sounds like your drive was physically damaged.
This recently happend to a mail server of ours,
and I had to reinstall the whole thing.
(After long fsck sessions, only a small part
of the file systems was accessible, and there
was nothing of value that could be salvaged)

Sorry for the Bad News (tm) :(

Gilad.