Easier way and more effective.
Drill a few holes through the hard drive, this takes out the chips, mechanical control mechanisms and tears perforations in the media. The media contains nano-sized bits of iron.
Next, take your kitchen sink and fill it with warm water and add some table salt and some bleach. Soak the hard drive in this overnight. In the morning, drain the sink and toss It, wet the garbage. Let chemistry do its magic. Between the bleach removing the oils, the salt water will corrode the iron and oxidize it to the point of non-recovery.
Quick, easy and done.
Thanks! You'll never take it alive, coppers!
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One of our younger relatives was an II/computer wizard.
He recommended the same procedure as you recommended except to use a metal bucket to hold the hot water, bleach, salt and your drilled hard drive after you drilled the holes into the hard drive.
Leave it over night and throw it way.