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Re: Default number of overwrites in shred
From: |
Paul Eggert |
Subject: |
Re: Default number of overwrites in shred |
Date: |
Fri, 04 May 2007 00:10:45 -0700 |
User-agent: |
Gnus/5.110006 (No Gnus v0.6) Emacs/21.4 (gnu/linux) |
Peter Eckersley <address@hidden> writes:
> We might choose 2, because of the 1% chance of recovery cited by one of
> the recovery firms in that paper.
>
> Or 3, because we're paranoid.
DoD 5220 specifies 3, in a certain way, so perhaps that should be the
default. But that's a pretty old standard; time has marched on.
CMRR claims that the ATA SECURITY ERASE UNIT command is just as
secure, and is a lot, lot faster. And NIST 800-88
<http://csrc.nist.gov/publications/nistpubs/800-88/NISTSP800-88_rev1.pdf>
page 8 says "Studies have shown that most of today's media can be
effectively cleared by one overwrite." I view that as a more reliable
than an offhand unsourced claim by one recovery firm out of many,
which is why I suggested defaulting to one overwrite.
- Default number of overwrites in shred, Peter Eckersley, 2007/05/03
- Re: Default number of overwrites in shred, Paul Eggert, 2007/05/03
- Re: Default number of overwrites in shred, Peter Eckersley, 2007/05/03
- Re: Default number of overwrites in shred,
Paul Eggert <=
- Re: Default number of overwrites in shred, Jim Meyering, 2007/05/04
- Re: Default number of overwrites in shred, Peter Eckersley, 2007/05/04
- Re: Default number of overwrites in shred, Jim Meyering, 2007/05/04
- Re: Default number of overwrites in shred, Paul Eggert, 2007/05/04
- Re: Default number of overwrites in shred, Jim Meyering, 2007/05/04
- Re: Default number of overwrites in shred, Peter Eckersley, 2007/05/04
- Re: Default number of overwrites in shred, Philip Rowlands, 2007/05/05
- Re: Default number of overwrites in shred, Pádraig Brady, 2007/05/06
- Re: Default number of overwrites in shred, Paul Eggert, 2007/05/08
- Re: Default number of overwrites in shred, John Cowan, 2007/05/04