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Copyright © Acronis, Inc., 2000-2007 119
The description of built-in information wiping methods
No. Algorithm (writing
method)
Passes Record
1. United States
Department of
Defense 5220.22-
M
4 1
st
pass – randomly selected symbols to
each byte of each sector, 2 –
complementary to written during the 1
st
pass; 3 – random symbols again; 4
writing verification.
2. United States:
NAVSO P-5239-26
(RLL)
4 1
st
pass – 0x01 to all sectors, 2 –
0x27FFFFFF, 3 – random symbol
sequences, 4 – verification.
3. United States:
NAVSO P-5239-26
(MFM)
4 1
st
pass – 0x01 to all sectors, 2 –
0x7FFFFFFF, 3 – random symbol
sequences, 4 – verification.
4. German: VSITR 7 1
st
– 6
th
– alternate sequences of: 0x00
and 0xFF; 7
th
– 0xAA; i.e. 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0xAA.
5. Russian: GOST
P50739-95
1 Logical zeros (0x00 numbers) to each
byte of each sector for 6
th
to 4
th
security
level systems.
Randomly selected symbols (numbers)
to each byte of each sector for 3
rd
to 1
st
security level systems.
6. Peter Gutmann’s
method
35 Peter Gutmann’s method is very
sophisticated. It’s based on his theory of
hard disk information wiping (see
http://www.cs.auckland.ac.nz/~pgut001
pubs/secure_del.html).
7. Bruce Schneier’s
method
7 Bruce Schneier offers a seven-pass
overwriting method in his Applied
Cryptography book. 1
st
pass – 0xFF, 2
nd
pass – 0x00, and then five times with a
cryptographically secure pseudo-random
sequence.
8. Fast 1 Logical zeros (0x00 numbers) to all
sectors to wipe.
119


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