On 4/08/2014 7:51 PM, Joel Rees wrote: > On Mon, Aug 4, 2014 at 3:53 PM, Andrew McGlashan > <andrew.mcglashan@affinityvision.com.au> wrote: >> [...] >> If you do the /dev/zero against a volume, then no useful data will >> remain on that volume ... you need to backup that file system first, >> then restore it after you re-create the file system again. > > Well, that depends on a number of things. In the worst case scenario, > electron microscopes have a much easier time recovering data > overwritten with zeros than data overwritten with random stuff. Okay, so that means, if you are that paranoid, then do /dev/urandom a few times before you do anything else.... ;-) Just the same, I think it was something that people worried about, but no-one has ever been subject to this kind of /attack/ > Also, I understand that there are some very intelligent controllers > that compress zeroed blocks and other such helpful things. That wouldn't matter post luksFormat, it would pre though. Cheers A.
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