Bah, get a shredder!
If you have loads of drives to destroy then a shredder would be loads quicker and leave the platters in teeny little bits.
Plus a shredder could be used to destroy other useless IT bits.
And, shredders are fun:
http://www.ssiworld.com/watch/watch-en.htm
Pissed off with that cranky office copier? These people can bring you joy!