Perfect solution... 220 comes right out of your little wall (in america anyways) all you need to do is rig up a simple resister... your hdd being the resister... you could make it interesting and have some capasiters in there to... give it a jolt of a couple thousand volts with constant running electricty will bring the temp way up and will also fry it... the electricity should scramble everything (I dont know that for sure but I'm pretty sure I'd do the trick) ... if the 1000 V of electrons doesnt the heat will...

... next issue... will the electricity actually pass through the case containing the actual disk or is it "protected" from surges? if not then you have it made... if not you will have to figure that out too.

***DANGER*** this may be FIRE HAZARD! lol