How does Gutmann work?

[RichardE]

Posted this in HT...but it not be HT...

The wiki article didn't give much, and the papers I found on it were way over my head. Anyone able to describe how Gutmann overwriting (35 pass) works? I was thinking that if it is a specific algorithm than it is not really random and couldn't you just reverse the read overs to get back to the original data?

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Zim Hosein

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[theflyingpig]

One pass is enough. Anyone who says otherwise is a fool.