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Date: Wed, 05 Oct 2005 11:55:18 -0700
From: Joe S <js.lists@gmail.com>
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To: Jonathon McKitrick <jcm@FreeBSD-uk.eu.org>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Hidden spot on hard drives?
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Jonathon McKitrick wrote:
> the company where I work (with Windows) is evaluating a copy protection
> product that stores info somewhere on the HDD where the user cannot touch it,
> a format will not erase it, and Norton Ghost will not find it.
> 
> 1.  Any idea where this info could be stored?
> 2.  Any way the same thing could be done under FreeBSD?
> 
> Thanks,
> 
> jm

# dd if=/dev/zero of=/dev/zero

Will overwrite the entire drive.