When you need to make sure your data is truly destroyed, use one of these.
Manual Hard Drive Destroyer
Government specifications require that in an emergency situation a hard drive needs to be destroyed so that a person or persons can not spin the drive. This must be done quickly and reliably. The MHDD meets this requirement. It takes less than 15 seconds to destroy each hard drive. All one needs to do is to insert the proper drive height adaptor (if applicable) into the slot and crank the handle 8 rotations. The internal workings of the unit press down on the drive, bending it approximately 90 degrees. The MHDD then pushes the destroyed hard drive out for easy disposal.
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