Am Sun, 12 Jul 2015 18:32:39 +0200 schrieb Volker Armin Hemmann <volkerar...@googlemail.com>:
> Am 12.07.2015 um 14:35 schrieb Marc Joliet: > > Hi, > > > > I have to failed drives that I want to give away for recycling purposes, but > > want to be sure to properly clear them first. They used be part of a btrfs > > RAID10 array, but needed to be replaced (with "btrfs replace"). (In the > > meantime I converted the array to RAID1 with only two drives.) > > > > My question is how precisely the disks should be cleared. From various > > sources > > I know that overwriting them with random data a few times is enough to > > render > > old versions of data unreadable. I'm guessing 3 times ought to be enough, > > but > > maybe even that small amount is overly paranoid these days? > > > > As to the actual command, I would suspect something like "dd if=/dev/urandom > > of=/dev/sdx bs=4096" should suffice, and according to > > https://wiki.archlinux.org/index.php/Random_number_generation#.2Fdev.2Furandom, > > /dev/urandom ought to be random enough for this task. Or are cat/cp that > > much > > faster? > > > > Any thoughts? > > > > Greetings > > actually 1 time is enough. With zeros. Or ones. Does not matter at all. If you look at my initial response to Rich, I already concluded that "one time is enough", although I'm going to stick with whatever random data shred(1) produces. -- Marc Joliet -- "People who think they know everything really annoy those of us who know we don't" - Bjarne Stroustrup
pgpykgWwMsVBc.pgp
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