Preparing a hard drive for disposal can take the form of software which electronically randomizes the bits, or a device which magnetically erases the information. However, nothing beats the finality and satisfaction of physical destruction. A company called SSI Shredding Systems has produced a series of videos demonstrating their products, which include a hard drive shredder. For fun I recommend their videos of other items being shredded, even if they have nothing to do with data security. My favorite is the VW Hippie Bug. Other companies have used YouTube to demonstrate their wares, and their commercials can be instructive and interesting. On the flip side of the coin, a British program called The Gadget Show tested a couple of rugged storage systems by subjecting them to water, then explosives. The results were as entertaining as they were illustrative.