secure deletion

[sunnysiderays]

What are the different in the settings in the secure deletion.

1) Smiple Overwrite (1Pass)

2) DOD 5220.22M (3 passes)

3) NSA (7 passes)

4) Guttmann (35 passes)

I do not know which one to choose or what they mean.

 

Thanks

[Sockdown]

What are the different in the settings in the secure deletion.

1) Smiple Overwrite (1Pass)

2) DOD 5220.22M (3 passes)

3) NSA (7 passes)

4) Guttmann (35 passes)

I do not know which one to choose or what they mean.

 

Thanks

 

Simple Overwrite: Overwrites with data on the file with Random Bytes I suppose.

 

U.S. DoD 5220.22-M (3-pass standard): A three-pass wipe. The 1st pass writes all 0's to the drive, the 2nd pass writes all 1's to the drive and the 3rd pass writes a random pattern.

example: 0000 0000, followed by 1111 1111, then 1001 0111.

 

U.S. DoD 5220-22.M (7-pass standard): A seven-pass wipe using random characters, complements of characters, and random data streams.

 

Guttman: here

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From 1 to 4, number 1 being the fastest deletion cause it overwrites the file once and 4 the slowest since it has to overwrite the file 35 times.

 

-Sockdown-