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How do I zero out my disk?

Discussion in 'OS X Mountain Lion (10.8)' started by TSX, Jan 15, 2013.

  1. TSX
    macrumors 68030

    TSX

    #1
    I want to zero out my HD and I'm in mountain lion. How do I go about doing this?
     
  2. macrumors 603

    blueroom

    #2
  3. TSX
    macrumors 68030

    TSX

    #3
  4. macrumors 603

    blueroom

    #4
    Yep, Erase, Security Options.

    It'll take awhile...
     
  5. macrumors 68020

    charlieegan3

    #5
    This is going to take a long time, be ready to twiddle your thumbs.
     
  6. TSX
    macrumors 68030

    TSX

    #6
    I'm in no rush but thanks for the replys.
     
  7. Moderator

    dejo

    Staff Member

    #7
  8. TSX
    macrumors 68030

    TSX

    #8
    1 pass,3 pass or 7 pass? And how long will it take for a 1 TB drive.
     
  9. macrumors 6502a

    dastinger

    #9
    It depends on which type of security you want to implement. If you really want to make sure the data is never recovered ever use the 7 pass option.
     
  10. macrumors 68030

    Krazy Bill

    #10
    Long enough to grow weary and cancel the erasure about 1/3rd through.
     
  11. macrumors 6502a

    #11
  12. Quad5Ny, Jan 21, 2013
    Last edited: Jan 21, 2013

    macrumors 6502a

    #12
    [​IMG]

    A Zero pass on a 120GB drive takes about a hour at USB2 speeds (33MB/s). A good 1TB HDD today can hit about 130MB/s. So best case is about 2 hours, worst case 8 1/2.

    While it might have been true sometime in the 70's/80's, it's in no way true today. The density of today's hard disks prevent any recovery after the drive has been Zeroed.

    For a HDD all you need to do is a single Zero pass, anything more and your wasting your time. SSD's on the other hand need to have the Secure Erase ATA command sent to them (and this only works if the SSD manufacturer implemented it correctly).
    .
     
  13. macrumors 6502a

    dastinger

    #13
    Didn't know about that. Thanks for the heads up :)
     
  14. macrumors 6502a

    #14
    There's a lot of mis-information spread about the internet on erasing hard drives and recovery of the data. If you have the time, do a Google search for "zeroed hard drive recovery". :p
     
  15. macrumors 6502a

    dastinger

    #15
    Will do! I was talking mostly based on what OSX itself says (or said?) when describing the different security options available.
     

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