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File Definitions

FILExtinguisher™ Wiping Methods

Wipe Method Definition Security
Grade
1. Super Fast Zero Write
This
method will overwrite the target data area with a fixed value
(0x00) on every 3rd sector.
Low
Grade
2. Fast Zero Write
This
method will overwrite the target data area with a fixed value
(0x00) on every other sector.
Low
Grade
3. Zero Write
This
method will overwrite the target data area with a fixed value
(0x00) throughout the entire area.
Low
Grade
4. Random Write
Overwrites
the target data area with random values. The user selects the
number of passes, from 1 to 9
Medium

Grade
5. Random & Zero Write
After
overwriting the target data area with random values, it will
overwrite once again with a fixed value (0x00) overwrites with
random values and then with zero; more secure than zero write.
Medium

Grade
6. US Navy, NAVSO P-5239-26

  • MFM
  • This
    is the US Navy standard NAVSO P-5239-26 for MFM encoded drives.
    This deletion method first writes the fixed value (0xffffffff)
    to the target data area, then the fixed value (0xbfffffff) and
    then random values. Finally, the target data area is read to
    verify the overwrites
    Medium

    Grade
    7. US Navy, NAVSO P-5239-26

  • RLL
  • This
    is the US Navy standard NAVSO P-5239-26 for RLL encoded drives.
    This deletion method first writes the fixed value (0xffffffff)
    to the target data area, then the fixed value (0x27ffffff) and
    then random values. Finally, the target data area is read to
    verify the overwrites.
    Medium

    Grade
    8. Bit Toggle
    This
    method will overwrite the target data area four times, first
    with the value (0x00), then with the value (0xff), then (0x00),
    then (0xff). 
    Medium

    Grade
    9. Random Random Zero
    This
    method first overwrites the target data area twice with random
    values, then once more with the fixed value (0x00). Overwrites
    twice with random values and then once with zeros; more secure
    than Random & Zero Write
    Medium

    Grade
    10. US Department of Defense (DoD 5220.22-M)
    The
    deleting method was introduced by the US Department of Defense
    (Pentagon) and is known as “DoD5220.22-M”.
    It will overwrite the target data area first by writing a fixed
    value (in our case, 0x00) once, then its compliment value (in
    our case, 0xff) once and finally random values once.  After the random value overwrite is complete, the disk is
    read to verify the overwrites. 
    Medium
    Grade
    11. US Air Force, AFSSI5020
    This
    is the US Air Force standard AFSSI5020. This deletion method
    first overwrites the target data area with the fixed value
    (0x00), then with the fixed value (0xff) and then with a
    randomly selected constant. Finally, at least 10% of the drive
    is read to verify the overwrites
    Medium
    Grade
    12. North Atlantic Treaty Organization

  • NATO standard

  • This
    method is the deletion standard of North Atlantic Treaty
    Organization (NATO). It will overwrite the target data area 7
    times. The first six overwrites are with the fixed values (0x00)
    and (0xff), alternating between passes. The 7th overwrite is
    with a random value
    High
    Grade
    13. Peter Gutmann Secure Deletion
    This
    method was introduced by Peter Gutmann in the year 1996.  This is perhaps the most secure deletion method
    available.  It will overwrite the target data area by writing random
    values four times on each sector. Next, it will overwrite the
    target data area with carefully chosen fixed values on each
    sector, 27 times. Finally, it will write random values 4 times
    on each sector. This is 35 write passes in total.
    High

    Grade
    14. US Department of Defense (DoD 5220.22-M) + Gutmann Method
    This
    is very secure deletion. It will use the US Department of
    Defense (DoD5220.22-M) standard method followed by the Gutmann
    deletion method. 
    Very
    High

    Security

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