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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Geoff Fritz <gfritz@gmail.com>
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Cc: "John ." <comp.john@googlemail.com>, freebsd-questions@freebsd.org
Subject: Re: please recommend a disk-exercising program?
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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