Acronis privacyexpert 2003 Manuale Utente

 

 

 

features of recording data to all types of hard disks. This knowledge speaks 
to the necessity of complex multipass algorithms to guarantee information 
wiping. 

The detailed theory of guaranteed information wiping is described in an 
article of Peter Gutmann, please see:  

The table below briefly describes information wiping algorithms used by 
Acronis PrivacyExpert. Each description features the number of hard disk 
sector passes along with number(s) written to each sector byte. 

NN 

Algorithm 

(writing 

method) 

Passes Record 

1. 

American: DoD 
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. 

American: 
NAVSO P-5239-
26 (RLL) 

4 1

st

 pass – 0x01 to all sectors, 2 - 

0x27FFFFFF, 3 – random symbol 
sequences, 4 – verification. 

3. 

American: 
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. 

42

 

Appendix A : Hard Disk Wiping algorithms