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seems to be careless not to burn current residence to the ground as well

Then salt the earth

I think 6 feet should be enough in most cases, if you're short on time or energy.

Turn off your computer and make sure it powers down,

Drop it in a 35-foot hole in the ground,

Cover it completely, rocks and boulders should be fine...

Pretty sure you could still recover the flash-based memory. Unless you're dropping into acid or lava.