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From: 3ksnn64@pur-ee.UUCP (Joe Cychosz)
Newsgroups: sci.crypt
Subject: Re: Erasing magnetic media
Message-ID: <6973@pur-ee.UUCP>
Date: Tue, 3-Nov-87 20:42:28 EST
Article-I.D.: pur-ee.6973
Posted: Tue Nov  3 20:42:28 1987
Date-Received: Sat, 7-Nov-87 09:05:40 EST
References: <7566@reed.UUCP> <1175@cup.portal.com> <1945@crash.CTS.COM>
Reply-To: 3ksnn64@pur-ee.UUCP (Joe Cychosz)
Organization: Purdue University Engineering Computer Network
Lines: 10

In article <1945@crash.CTS.COM> ag@crash.CTS.COM (Keith Gabryelski) writes:

>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.
>

Small signal analysis can be used to recover "each layer" of data written.