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If you're that concerned, and assuming the drive is not so totally hosed as to kill all write ability, there's a program called Secure Delete available. You burn it on CD, run it on the computer you want 'gone', and give it a few hours. The idea is that it'll destructively overwrite sectors in such a way as to make it difficult to impossible to recover any older data using residual magnetics.
I don't recall where I came across it in my travels, but I do have it on a CD that I could probably make an image of, if you'd like.
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