Scratch off the foil covers over the screws, undo screws, open up the hard drive, and drop in the screws you just took out and shake it about.
Look for the bit with loads of screws stuck to it. It's a pair of magnets with a copper coil in between. Prise the two magnets apart, keeping your fingers well clear.

I volunteer to destroy the work hard drives when we scrap old PCs. I cash in the solid aluminium casings and spindles and stainless steel platters and lids at the scrap yard for beer money, and use the magnets to stick stuff to the walls of my metal shed.
( Pope Shax XIII uses Visio for picture editing, does it show?, Thu 10 May 2012, 5:26, Reply)