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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Warren Block <wblock@wonkity.com>
Subject: Re: SATA disk disappears
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>> self tests can not find any errors/bad sectors.
>
> Hmm.  The green drives are supposed to go to sleep for power saving, and then 
> there's a multiple-second delay when they have to spin back up on access. 
no it wasn't that.

i did long test as you recommended and drive reported fault.
Gave it back for replacement. Thank you