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From: ag@crash.CTS.COM (Keith Gabryelski)
Newsgroups: sci.crypt
Subject: Re: Erasing magnetic media
Message-ID: <1945@crash.CTS.COM>
Date: Mon, 2-Nov-87 14:14:06 EST
Article-I.D.: crash.1945
Posted: Mon Nov  2 14:14:06 1987
Date-Received: Fri, 6-Nov-87 21:42:00 EST
References: <7566@reed.UUCP> <1175@cup.portal.com>
Reply-To: ag@crash.CTS.COM (Keith Gabryelski)
Organization: Crash TS, El Cajon, CA
Lines: 17
Summary: please explain further.

In article <1175@cup.portal.com> Kenneth_R_Jongsma@cup.portal.com writes:
>Others may be interested.... The actual requirement is that the media
>be written with at least 100 alternating 1/0 bits. i.e 11111 00000 11111,
>etc...  Some media cannot be declassified. If memory serves, the old (still
>in use in the Minuteman system) core memory had to be destroyed.

I am interested in 'Why' 100 alternate 1/0 writes will not declassify some
media.  It seems to me that after 5 or so random 1/0 writes the original
data would be so far gone that retreival by any means is impossible.

Enlighten me.

--Keith

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