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Date: Tue, 09 Aug 2005 15:14:38 -0400
From: Chuck Swiger <cswiger@mac.com>
Organization: The Courts of Chaos
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To: "O. Hartmann" <ohartman@mail.uni-mainz.de>
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Cc: freebsd-stable@freebsd.org, freebsd-questions@freebsd.org
Subject: Re: ad10: WARNING - READ_DMA UDMA ICRC error (retrying
	request)	LBA=11441599
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O. Hartmann wrote:
[ ... ]
> One of  my SATA disks, the SAMSUNG SP2004C seems to show errors during 
> operation (and also showd under 5.4-RELEASE-p3).
> Sometimes I get this error:
> ad10: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=11441599
> while the machine still keeps working.
> Other days the box crashes completely.
> 
> Is this a operating system bug or is this message an evidence of 
> defective hardware?

Back up any data you care about now.  Use the smartmontools port or hunt down a 
utility from Samsung which'll do a surface test (read only, nondestructive).

You can also run a "dd if=/dev/ad10 of=/dev/null bs=8192" to do a full read 
test under FreeBSD, and see how many CRC errors show up.

-- 
-Chuck