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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Date: 01 Aug 2005 13:36:24 -0400
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Subject: Re: harddrive error?
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"andrew@mediashell.org" <andrew@mediashell.org> writes:

> i get a spam of errors on the screen that looks something like this
> 
> ad4: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=137895
> ad4: FAILURE - READ_DMA status=51<READ,DSC,ERROR>
> error=84<ICRC,ABORTED> LBA=293567
> 
> i have no idea

You don't mention most of the important information (see
http://www.freebsd.org/doc/en_US.ISO8859-1/articles/freebsd-questions/index.html),
but these symptoms often indicate a cabling problem.  

There have also been some issues with specific controllers, although
most of them seem to have been cleaned up by now.  Try updating your
system, especially if you are running an old 5.x.