Secure random erase

Discussion in 'Mac OS X Lion (10.7)' started by Tech198, Sep 5, 2011.

  1. Tech198 macrumors G5

    Mar 21, 2011
    Australia, Perth
    From a security standpoint, how long does it take to securely erase a hard drive using: diskutil syntax. With the random erase option.

    Approx. For 500. Gig

    And when Apple says "random" in general to the pass applied, apart from the zero-pass, they all do somewhat, is it Truly random? As apple doesn't say what patten.
  2. mrapplegate macrumors 68030

    Feb 26, 2011
    Cincinnati, OH
    I would think it would vary for each computer, hard drive RPM speed, etc. As for the pattern part, if there were a pattern it would not be random.
    Truly random? I think you're getting into semantics, as one could debate random.
  3. Quad5Ny macrumors 6502a


    Sep 13, 2009
    New York, USA
    At 33MB/s zeroing a 120GB HDD took me about a 55min yesterday. So if you do some math, I'm sure you could figure out how long 500GB (at a different write speed) would take.

    Oh and don't bother with the random pass, its not much more secure than writing zeros.

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