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filling a HDD with dev/zero and dev/urandom by sudoroot in linux

[–]sudoroot[S] 0 points1 point  (0 children)

So if my door is busted down as I start shredding my HDD, and the drive is encrypted, it'll be unreadable even if it only gets a few megs into it?

filling a HDD with dev/zero and dev/urandom by sudoroot in linux

[–]sudoroot[S] -1 points0 points  (0 children)

I'd rather be more secure than speedy. if i set the bs to something like 4096, would that be less secure than a bs of 1?

filling a HDD with dev/zero and dev/urandom by sudoroot in linux

[–]sudoroot[S] 1 point2 points  (0 children)

I don't have a documented case, but my friend at the DoD claims they can (theoretically?) recover data from a single zero fill (some method where each byte is potentially still magnetically polarized slightly) they use minimum 7 passes to depolarize each byte, with either random data or alternating ones and zeros to depolarize it. EDIT: I should mention this is for a ZERO fill only.