How to wipe a HD?
Bruno Wolff III
bruno at wolff.to
Sat Apr 23 18:29:21 UTC 2005
On Sat, Apr 23, 2005 at 14:00:21 -0400,
"Robert P. J. Day" <rpjday at mindspring.com> wrote:
> On Sat, 23 Apr 2005, Bruno Wolff III wrote:
>
> another solution is to boot from a CD and just rewrite the entire
> drive several times using "dd" -- enough times to wipe that trace
> magnetization. start with
>
> # dd if=/dev/zero of=/dev/hda ...
>
> now, it's too bad there's no /dev/ones.
>
> but you could also keep overwriting with /dev/random. after a
> while, i'm pretty sure there won't be much salvageable from the drive.
That won't cover remapped sectors. You should be able get a count of
remapped sectors using smartctl. But I think if you are worried about
people paying to have data extracted from the trace magnetization, you
are better off destroying the drive with witnesses.
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