See who made the hard drive and get their utility for writing
the ENTIRE drive with ZEROS.
After you know the manufacturer someone on the list may be
able to tell you where to find that utility, (both the WEB site and
which part of the software suite.)

From: "Lewis M Russakov"
>I am planning to give my old computer away and would like to clean out my
> hard drive.
>
> I am certain that this has been answered many times before, unfortunately
> I was unable to find any thing in the Archives.
>
> I know that if you just reformat the HD, it really isn't clean until it
> is over written.
>
> Hoping some one can give me the directions.

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