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