To render a hard disc unreadable heat it to 2500 degrees Celsius,
then disperse the result.
I think that is fairly secure.
A device called a SQUID can read the echoes of bits overwritten by
zeroes, on a reformatted HDD. Mind you, there are not many of them
around.
As a more practical gesture, use the purloined letter technique, or
have a pair of HDDs otherwise identical except one is used for
secret stuff and the other not. Swap as needed. Can one run off a
CD-R or a Jazz disc yet?
--- OffRoad 1.9r registered to Adrian Midgley
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