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128 Copyright (c) 2000-2009 Acronis. All rights reserved.
Copyright (c) 2009 Seagate Technology LLC. All Rights Reserved.
C.2 Information wiping methods used by Seagate BlackArmor
Backup
The table below briefly describes information wiping methods used by Seagate.
Each description features the number of hard disk sector passes along with the
number(s) written to each sector byte.
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.
128


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