The body of most harddrives is a chunk of aluminum, so if you're into casting, you can melt that and use it. Aluminum tends to oxidize very quickly during a melt, so melting thin stuff like beverage cans has a relatively low yield of usable metal, but harddrives should be much better. I think I have a couple dozen waiting for the day I finally get around to doing some casting. I'd love to make a Gingery-style lathe
