the way the army does it is to run a program that writes a 0 or 1 at random to every sector of the harddrive thus overwriting any and all information stored on the drive. (in general when stuff is deleted it's still there, it's just ignored by the computer until it gets overwritten in which case it's almost certainly gone)
There is some software that overwrites the bits the data was stored on when it deletes stuff, look around, there should be some for free.
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"Any attempt to cheat, especially with my wife, who is a dirty, dirty, tramp, and I am just gonna snap." Knibb High Principal - Billy Madison
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