Well, if you don't have access to thermite [...]
Actually, red heat is well above the Curie temperature for most media,
isn't it? You could chuck the platters into the coals of a bonfire,
let them get up to a nice cherry red. Depending on what the platters
are made of, this might even melt them, which should effectively
destroy any organization in the material that once formed a thin film
on them. If not, it should demagnetize the coating....
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