Formating with just a quick format won't truly get rid of the data, it just allows files to overwrite what was previously there.
the easiest and quickest way to destroy the data without destroying the drive (e.g. using a hammer) would be to write 0's across the entire drive.
There are lots of tools to do this. One being Western Digitals Digital Lifeguard Tools. You can download it from their site.. Not sure if it works with all drives or just WD ones though.
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"All that we can do is just survive.
.All that we can do to help ourselves is stay alive." - Rush
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