MOD method

Swifty

New Member
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?
 

garrett01

Administrator
Staff member
>>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
 
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