From mboxrd@z Thu Jan  1 00:00:00 1970
From: cym224@gmail.com (Nemo)
Date: Tue, 24 Apr 2018 09:01:34 -0400
Subject: [TUHS] /dev/drum
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On 24 April 2018 at 05:57, Dave Horsfall <dave at horsfall.org> wrote:
[...]
> A well-known question in the security field, for instance, is how do you
> know that you have *really* erased that disk?  The thing can lie as much as
> it likes, and you'll never know for sure.

That reminds of an old mil-spec that told you how to dispose of
disc-packs by grinding down the platters by hand, what grit of paper
to use, which directions, and how often.  (Exact number escapes me.)

N.