Erase method

Erase methods for Disk Shredder 4
Erase method Iteration Written/Verify pattern Disk Shredder 4
Standard Super Lite
NSA recommendation 3 random numbers 2 times → zero ○ ○ ×
Random numbers
1 time		 1 random numbers 1 time ○ ○ ○
Random numbers
2-5 times		 2～5 random numbers 2-5 times ○ ○ ×
Random numbers
6-9 times		 6～9 random numbers 6-9 times × ○ ×
US Army compliant
(AR380-19)		 3 random numbers → fixed value 1 → fixed value 2 × ○ ×
US Navy compliant
(NAVSO P-5239-26)		 3 fixed value 1 → … → fixed value 3 → verify × ○ ×
US Air Force compliant
(AFSSI5020, AFI33-202)		 7 fixed value 1 → … → fixed value 7 → verify × ○ ×
US Department of Defense complaint
(DoD5220.22-M)		 3 fixed value 1 → fixed value 2 → random numbers → verify × ○ ×
NCSC complaint
(NCSC-TG-025)		 3 fixed value 1 → … → fixed value 3 × ○ ×
NCSC compliant 2 times
(NCSC-TG-025)		 6 fixed value 1 → … → fixed value 6 × ○ ×
Gutmann recommendation 35 random numbers 4 times →fixed value 1 → … → fixed value 27 → random numbers 4 times × ○ ×
  • In case of “Disk Shredder 4 Standard”, you can select “NSA(National Security Agency) recommendation” and “random numbers, 1-5 times”. In case of “Disk Shredder 4 Super”, you can select all the above-mentioned erase methods.
  • In case of “Disk Shredder 4 Lite”, the erase method is fixed as "random number, once writing." If you order 10 pieces or more at once, you can change the erase method. ( Erase-method-change service )
  • A “verify” task checks whether Disk Shredder 4 wrote values correctly after the value-writing.
  • NSA : The National Security Agency
  • NCSC: The National Computer Security Center
  • Gutmann recommendation is an erase method proposed by Gutmann, on his paper in 1996. A major feature is that the overwrite data is theoretically-calculated for leaving the least traces of data by analyzing data encoding methods(formatting methods) such as RLL(Run Length Limited) or MFM(Modified FM).