If you have one old broken harddrive, and you donno what to do with it except to throw it out, look at the above picture, This is a clock made out of an old 120MB harddrive which was lying around in the store room. I used a working clock, removed the clock mechanism from the clock case, and attached it to the platter, and glued it to the Logic ckt board. you can also try making one of these clocks.