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Thermite doesn't just create fire, it burns at such a high temperature your hard drive would become a molten mess. However this is considered a booby trap, so you could get sued by whoever sets it off.
Put it this way, before degaussing can work effectively, you have to remove all the casing around the hard drive. Meaning, you can't just whip it out of your computer and put it in your degausser. Putting a tape/VHS degausser over your hard drive is not effective enough and will possibly leave some data and even whole files intact.
Lastly, good degaussers cost upwards of $3500 USD.
On the other hand, it seems that a neat method is to put a brick of thermite over your HDD and have a little mechanism to set it off. Apparently a thin layer of nitro with a ribbon of magnesium is an effective way to light the thermite.
Good lord! What could you possibly have on your hard drive that you'd be willing to risk conviction on an ATF explosives charge?