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.
