On Mon, 2016-08-29 at 09:32 +0300, Georgi Guninski wrote: > On Sun, Aug 28, 2016 at 06:31:59PM -0700, Razer wrote: > > multipass Zero writeovers, but that's not the standard setting. > > > Why _Zero_ overwrite? Read that at least on magnetic hard drives this is > potentially recoverable with special equipment. Don't know about SSD. > shred(1) overwrites with random.
Probably because quite a few people consider it neater, and also because it allows one to make a sparse file of a disk image. Of course the flip side of this is that if you are using, say, ~100MiB of a ~1TiB filesystem, the other ~924MiB is going to have zeroes and thus any forensic analysis can be concentrated on the ~100MiB that doesn't. But, you're free to dd from /dev/urandom to a new file afterwards if you really want (this is how BleachBit wipes free space, BTW: writing to a file which is immediately deleted). -- Shawn K. Quinn <skqu...@rushpost.com>
