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Date:      Sun, 7 Jun 2009 19:49:41 +0200 (CEST)
From:      Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To:        Geoff Fritz <gfritz@gmail.com>
Cc:        "John ." <comp.john@googlemail.com>, freebsd-questions@freebsd.org
Subject:   Re: please recommend a disk-exercising program?
Message-ID:  <alpine.BSF.2.00.0906071948490.99901@wojtek.tensor.gdynia.pl>
In-Reply-To: <20090607165504.GA67823@dev.null>
References:  <abc784790906070243t419d8ebbp59a68af23e902004@mail.gmail.com> <20090607165504.GA67823@dev.null>

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>
> I've seen several mentions of "dd" in this thread, and I'll say that I've
> seen several recommendations elsewhere to use a simple:
>
> 	dd if=/dev/<device> of=/dev/<device>

forgot bs=1m or at least 64kB, unless you like to wait days with default 
bs=512

>
> to "refresh" the drive.  That is, dd will read the block(s), then attempt to
> write them back, and if there are problems, the drive should re-map the sector


add conv=noerror,osync



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