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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Christian Gusenbauer <c47g@gmx.at>
Subject: Re: SATA disk disappears
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>>
>> 1T Red here.  The firmware is likely very similar.
>
> The same here: brandnew WD 2T green, 9.1 stable, svn rev. 244773, not using
> GEOM. I had that problem two times within the last two weeks, but the smart
> self tests can not find any errors/bad sectors.

smartctl -t long /dev/disk
found an error after few hours.