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Date: Sun, 7 Jun 2009 13:38:15 +0200 (CEST)
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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> Hello list,
>
> Can anyone please recommend to me a program that will stress-test a
> disk? If it matters, two are connected by firewire, another via usb.
> Filesystem is ufs. I think I have a disk that might be about to fail,
> but it only sometimes errors when under stress. I need to see if it

if it's about to fail then simply read it

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


if it will not - disk is most probably OK.