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Yes -- overwriting several times. There are programs that write the same small bit of binary data -- a zero -- over every writable space of the hard drive. It has to be done several times, because magnetic shadows of what was previously there remain. Many people "zero-out" their drives to wipe them clean about half a dozen times, to be certain of erasing residue of stored data. The drive with then appear to be a clean, unused drive under most inspections.
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less I say, smarter I am
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