ACRONIS True Image Home 2010 Netbook Edition Podręcznik Użytkownika Pobierz pdf (Strona 148)

No. Algorithm (writing method) Passes Record

verification.

2. United States: NAVSO P-

5239-26 (RLL)

pass – 0x01 to all sectors, 2 – 0x27FFFFFF, 3 –

random symbol sequences, 4 – verification.

3. United States: NAVSO P-

5239-26 (MFM)

pass – 0x01 to all sectors, 2 – 0x7FFFFFFF, 3 –

random symbol sequences, 4 – verification.

4. German: VSITR 7

– 6

– alternate sequences of: 0x00 and 0xFF; 7

– 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

to 4

security level systems.

Randomly selected symbols (numbers) to each byte

of each sector for 3

to 1

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 Secure Deletion of Data from Magnetic and

Solid-State Memory).

7. Bruce Schneier's method 7 Bruce Schneier offers a seven-pass overwriting

method in his Applied Cryptography book. 1

pass –

0xFF, 2

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.

1 2 ... 143 144 145 146 147 148 149 150 151 152 153 154

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ACRONIS True Image Home 2010 Netbook Edition Podręcznik Użytkownika Strona 148