@dajhorn: "Gutmann" or "PRNG 8 Pass" ?

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Anonymous

Guest
hello,

I wondered whether PRNG 8-Pass is more secure than the Gutmann method. When I erased my hdd with DBAN 1.0.1, I noticed that with PRNG 8 Pass it took only ~ 20% of the time a Gutmann wipe needs.

It is stated, that PRNG is probably the best method to use with modern hard drives. On what paper/literature is that statement based?

Btw, I'm not looking for 100% security, I know that this is only reached with physical destruction or exposition in a magnetic field with about 1.5 T or above.

Thx for your help,

greets, anonymous

PS: great program :D
 

dajhorn

Member
Most of the passes in the Gutmann wipe are designed to flip the bits in MFM/RLL encoded disks, which is an encoding that modern hard disks do not use.

In a followup to his paper, Gutmann said that it is unnecessary to run those passes because you cannot be reasonably certain about how a modern hard disk stores data on the platter. If the encoding is unknown, then writing random patterns is your best strategy.

IIRC, you can read about this at Gutmann's web site.
 
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Anonymous

Guest
Thx for your reply:)

hello dajhorn,

just wanted to say thanks for the information and the quick reply :D

greets, anon
 
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