A place I knows has a large capacity degausser, which a number of drives get thrown into for a rinse cycle, then they get tossed into a pile. When the pile gets big enough the industrial metal shredder is turned on and the pile gets turned in to little metal pieces which then get sold as scrap metal.
Pesonally my favorite is using old hard drives for target practice, with .223 or .50 rounds.
diana
