Gutmann's Method

Advanced File Shredder is capable of securely erasing data so that it can not be recovered ever using hardware recovery methods. It is implemented in the software by using a so-called Gutmann's method. This method is based on Peter Gutmann's paper , chapter "Erasure of data from magnetic media". In this paper it is shown that 35 predefined passes will securely destroy data despite of drive data encoding. The data matrix that this method uses is presented below 

Pass No. Data Written
1 Random
2 Random
3 Random
4 Random
5 01010101 01010101 01010101 0x55
6 10101010 10101010 10101010 0xAA
7 10010010 01001001 00100100 0x92 0x49 0x24
8 01001001 00100100 10010010 0x49 0x24 0x92
9 00100100 10010010 01001001 0x24 0x92 0x49
10 00000000 00000000 00000000 0x00
11 00010001 00010001 00010001 0x11
12 00100010 00100010 00100010 0x22
13 00110011 00110011 00110011 0x33
14 01000100 01000100 01000100 0x44
15 01010101 01010101 01010101 0x55
16 01100110 01100110 01100110 0x66
17 01110111 01110111 01110111 0x77
18 10001000 10001000 10001000 0x88
19 10011001 10011001 10011001 0x99
20 10101010 10101010 10101010 0xAA
21 10111011 10111011 10111011 0xBB
22 11001100 11001100 11001100 0xCC
23 11011101 11011101 11011101 0xDD
24 11101110 11101110 11101110 0xEE
25 11111111 11111111 11111111 0xFF
26 10010010 01001001 00100100 0x92 0x49 0x24
27 01001001 00100100 10010010 0x49 0x24 0x92
28 00100100 10010010 01001001 0x24 0x92 0x49
29 01101101 10110110 11011011 0x6D 0xB6 0xDB
30 10110110 11011011 01101101 0xB6 0xDB 0x6D
31 11011011 01101101 10110110 0xDB 0x6D 0xB6
32 Random
33 Random
34 Random
35 Random
   
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Current version 1.16 (June 7th 2010)
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