http://en.wikipedia.org/wiki/Gutmann_method
http://en.wikipedia.org/wiki/DOD_5220.22-M
DOD 5220.22-M data sanitization does 3 passes. NSA does 7 passes. Gutmann does 35 passes.
http:// en.wikipedia. org/wiki/ Gutmann_ method
http:// en.wikipedia. org/wiki/ DOD_5220. 22-M
DOD 5220.22-M data sanitization does 3 passes.
NSA does 7 passes.
Gutmann does 35 passes.