On Wed, 26 May 2010 03:01:26 +0545, Bipin Gautam said: > @Valdis: Those were from some ooold notes, (~4yrs) :) if you have full > hdd encryption wiping hdd header and backup header few (7?) times and > rest hdd with 1 random pass should be enough. My point is that even if the drive *wasn't* encrypted, a single-pass overwrite is sufficient to render it unrecoverable. > Wiping Magnetic storage is tricky on its own. It's actually not that hard, as long as you actually know how many gauss you *really* need to wipe a device (inside surface, near axis, of multi-platter devices is a particular gotcha). It's not worth worrying about wiping the remapped sectors on a disk - even an older 40G drive has some 80 million sectors on it - so even if you have a few hundred sectors that have remapped due to I/O errors, it's still literally a one-in-a-million shot that anything incriminating is in the sector. Plus it's a *bad* sector, so reading and recovering the data is a bitch...
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