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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: "John ." <comp.john@googlemail.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: please recommend a disk-exercising program?
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> :D
>
> okok, dd it is. I'll remove all data beforehand just in case. Thank
> you all for your replies.
> --

you may "cure" badblocks by

dd if=/dev/zero of=/dev/disk bs=1m

(but cleaning all data)

Disk will try to remap badblocks then.

But remember that it only make it's life a bit longer. this disk will 
fail again.