Acronis True Image 2015 - User Guide - Manual (Page 134)

134 Copyright © Acronis International GmbH, 2002-2014
Information wiping methods used by Acronis
The detailed theory of guaranteed information wiping is described in an article by Peter Gutmann.
Please see "Secure Deletion of Data from Magnetic and Solid-State Memory" at
http://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html.
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 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
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.
8.6 Mounting an image
Mounting images as virtual drives lets you access them as though they were physical drives. Such
ability means that:

A new disk appears in your system.

You can view the image contents in Windows Explorer and other file managers.
The operations described in this section are supported only for the FAT and NTFS file systems.
You cannot mount a disk backup, if it is stored on an FTP server.
How to mount an image
1. In Windows Explorer, right-click the image file that you want to mount, and then click Mount
image.
The Mount wizard opens.
2. Select the backup for mounting by its creation date/time. Thus, you can explore the data state at
a certain moment.