Some geeks have had hard drive roast featuring thermite placed on top of hard drives to melt them.

That sounds like a fun way to securely delete data given enough thermite.

--- Marina Brown
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Date: Mon, 31 Dec 2007 12:25:02 -0600
From: Marco Peereboom <slash@peereboom.us>
To: Jon <hypermails@gmail.com>
Cc: misc@openbsd.org
Subject: Re: delete deleted data
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Grind them up.  There is nothing else you can do to "permanently" wipe
disks.  Residual magnetism is always there provided good enough
equipment.  If your data is that sensitive there is nothing else but the
grinder.

On Mon, Dec 31, 2007 at 10:25:25AM -0800, Jon wrote:
quoted text
> hi
> 
>  I see a lot of programs that are available to clean up the disks for
> Windows OS. Not wipe a disk but clean up deleted files so they cannot be
> recovered.
>  Is there any program for OpenBSD that will clean up the disks so that
> deleted files cannot be recovered.
> 
>  (not looking to delete a file securly - but to wipe the disk clean of
> deleted file with out affecting the OS)
> 
> -jon