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Date: Fri, 1 Feb 2008 21:08:53 +0100 (CET)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Kurt Buff <kurt.buff@gmail.com>
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Cc: FreeBSD Questions <freebsd-questions@freebsd.org>
Subject: Re: This has begun to annoy me...
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> +ad6: TIMEOUT - WRITE_DMA retrying (1 retry left) LBA=4570911
> +ad6: TIMEOUT - WRITE_DMA retrying (1 retry left) LBA=42958719
> +ad6: TIMEOUT - WRITE_DMA retrying (1 retry left) LBA=113343327
> +ad6: TIMEOUT - WRITE_DMA retrying (1 retry left) LBA=117315327
>
> It looks like disk write errors to me, but I'm not sure.
>
yes it use.

use ports/sysutils/smartmontools

to make sure.

print smart output and/or these errors and request replacement in your 
shop.