Originally Posted by _JP_
1 - Turn on HDD.
2 - Attach rare-earth magnet to either side, top or bottom.
3 - ???
4 - PROFIT!
PROTIP: Slide the magnet around the HDD for maximum performance!
You will destroy the data but you could damage the drive itself or the read/write head if you use a magnet too strong. Also you might not scramble everything if you use a magnet not strong enough. 7-pass format makes for a good test to make sure the drive is reliable as well.