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Date: Wed, 10 Aug 2005 00:36:30 +0200
From: "O. Hartmann" <ohartman@mail.uni-mainz.de>
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To: Chuck Swiger <cswiger@mac.com>
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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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Chuck Swiger wrote:

> 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?
>
> 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.
>
I did so and I ran into a crash of the system ...

I changed the cabling, did it again and until now nothing happend ... 
hope it was only a cabling issue. The first time I use ATA/SATA and now 
these experiences ... When is SCSI back for desktops?