| Go to the manufacturer website and download their hard drive utility to write zero's to the drive.  This is called a low-level format.  This will wipe out the drive (and OS) and not make it recoverable no matter what....or so I was told.
 Replacing the hard drive with a new one is also a good idea  Then drive a screwdriver or nail thru before discarding.  Never assume just because it is thrown in the trash its gone.
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