Munku, a low level format should get rid of anything to the point that a simple tool like that cannot recover the data from. By low level, I mean wiping the drive by writing over ever bit with a 0.
typically when you delete a file, to save time it doesn't delete the data, but just flags it as "deleted" so when another program needs the space it writes over the data. This leaves many, many bits of files around in the left over space after the fact.
if you want to make sure people you know cant get into it I would suggest finding a tool that will let you format it by wiping it with all zeros. It will take much longer, but a small tool like that shouldn't be able to recover the data.
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