MOD method
- Thread starter Swifty
- Start date
>>What is the MOD method? The MOD method was built to wipe memory >>chips with 4 steps and not a 7 step hard drive wipe. What has been >>altered?
Standard DoD 5220.22-M / NISPOM 8-306:
US Department of Defense in the clearing and sanitizing standard DoD 5220.22-M recommends the approach "Overwrite all addressable locations with a character, its complement, then a random character and verify"
Thus 3 pass and 7 pass overwrite will look like:
Pass 1 write $00
Pass 2 write $FF
Pass 3 write RandomByte
Pass 4 write RandomByte
Pass 5 write RandomByte xor $ff
Pass 6 write RandomByte
Pass 7 write RandomByte
All of the overwrite methods really involve overwriting multiple passes
with random patterns. The secret really is to create a sufficiently large random stream, independent of each pass.
Garrett
Standard DoD 5220.22-M / NISPOM 8-306:
US Department of Defense in the clearing and sanitizing standard DoD 5220.22-M recommends the approach "Overwrite all addressable locations with a character, its complement, then a random character and verify"
Thus 3 pass and 7 pass overwrite will look like:
Pass 1 write $00
Pass 2 write $FF
Pass 3 write RandomByte
Pass 4 write RandomByte
Pass 5 write RandomByte xor $ff
Pass 6 write RandomByte
Pass 7 write RandomByte
All of the overwrite methods really involve overwriting multiple passes
with random patterns. The secret really is to create a sufficiently large random stream, independent of each pass.
Garrett