Comparing Overwriting Methodoligies

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I'm interested in hearing comments in general about how the dif. HD
overwriting methodologies compare as well as the following,

1. Description of the 'PRNG Stream' method displayed when DBAN has

 "This method fills the device with a stream from the PRNG. It is
probably the best method to use on modern hard disk drives because
encoding schemes vary.

This method has a medium security level with 4 rounds, and a high
security level with 8 rounds."

2. Whether or not the above statement is correct, just what is
considered "modern" in this context?

Would an approx. ten-year-old Toshiba MK2103MAV IDE 0,0,0,-,- be
considered "modern"?  

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Q: Is the Gutmann method the best method?

A: No.

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.

In particular, Gutmann says that "in the time since this paper was
published, some people have treated the 35-pass overwrite technique
described in it more as a kind of voodoo incantation to banish evil
spirits than the result of a technical analysis of drive encoding
techniques. As a result, they advocate applying the voodoo to PRML and
EPRML drives even though it will have no more effect than a simple
scrubbing with random data... For any modern PRML/EPRML drive, a few
passes of random scrubbing is the best you can do".

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