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From: Josh Paetzel <josh@tcbug.org>
To: freebsd-questions@freebsd.org
Date: Mon, 15 Nov 2004 19:16:50 +0000
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cc: sp0ng3b0b <sp0ng3b0b@sbcglobal.net>
Subject: Re: ad0: FAILURE - READ_DMA
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On Tuesday 16 November 2004 01:07, sp0ng3b0b wrote:
> I am having a strange problem and need some help. I installed
> FreeBSD on a Maxtor 300GB IDE drive that is less than 1 year old.
> After one day, FreeBSD complains about DMA problems. I got a LOT of
> these.
>
> ERROR MESSAGE:
> kernel: ad0: FAILURE - READ_DMA status=51<READY,DSC,ERROR>
> error=40<UNCORRECTABLE>
>
> I googled for the error, and foudn a suggestion that the drive may
> be failing. So I ran Maxtor disk diagnostics and it says the drive
> is failing. So I start the RMA process.
>
> In the meantime, I install a BRAND NEW Seagate 120GB 7200.7 hard
> drive. I install FreeBSD 5.3 on it. One day later, I get the SAME
> errors! Lots of em!
>
> kernel: ad0: FAILURE - READ_DMA status=51<READY,DSC,ERROR>
> error=40<UNCORRECTABLE>
>
> What is going on? Is FreeBSD destroying my disks? Here is some
> info:

More likely would be that your PSU is eating drives.  I would look at 
hardware way before trying to attach "blame" to FreeBSD. ;)
-- 
Thanks,

Josh Paetzel