Is there really an application for which multiple overwrites are called
for but for which thermite is not a better answer? It seems to me that
if the data are risky enough that you have to worry about anyone
opening the drive in a cleanroom and trying palimpsest magnetic-pattern
recovery, surely new drives are cheap enough that the security of
melting the drive into a puddle of liquid metal is easily worth the
cost. But, of course, I don't work in that space, so it's entirely
possible I'm just missing something.
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