Quote Originally Posted by CopperMiner View Post
Does the OP wants to wipe them to reuse them or just permanently destroy their contents?
The sense i get is that he wants to wipe them for re-use.

If you wanted to destroy them nuking them with an electromagnet would be one way. Some laptops have a strike point. Hit that with a hammer and that shatters the glass platters of the hard drive.

I usually just pull the logic board when i want to destroy a hard drive. E-waste buyers pay fairly well for that kind of circuit board.