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@cwebber You shouldn't fill the drives with plain zeros (that doesn't really destroy the information), but with random bits, e.g. using symmetrically encrypted zeros. Or use `shred`.
@abc Yes, you need some electronic equipment to read the plates' weak/residual magnetic properties. — That's not something you can do using just the standard HDD interfaces (buses & protocols). It's one of those hardcore infosec tricks. @cwebber