Question about zeroing data on hard disk

Discussion in 'macOS' started by quovadis, Feb 4, 2008.

  1. quovadis macrumors regular

    quovadis

    Joined:
    Oct 30, 2006
    Location:
    in PA
    #1
    I have noticed this a couple of times when doing a fresh reinstall of Leopard:

    If I use the option to "zero data once" with disk utility from installation disk and then do a fresh install of leopard, all the information is not removed from my internal hard disk.

    In particular, the spotlight privacy settings are retained. For example, when I attach my backup hard disk after the fresh install, I discover that it automatically appears under the "privacy" tab in the spotlight settings. The same happens for my Eyetv folder.

    Is there a way to ensure EVERYTHING really is erased before a fresh install of the OS?
     
  2. darwinian macrumors 6502a

    darwinian

    Joined:
    Jan 4, 2008
    Location:
    In R4, more or less
    #2
    Are you using Migration assistant or moving your home folder contents over after the install?
     
  3. Amdahl macrumors 65816

    Joined:
    Jul 28, 2004
    #3
    Those are probably defaults, not retained information.

    If your backup hard disk is a Time Machine disk, I'm pretty sure it doesn't get indexed.
     
  4. quovadis thread starter macrumors regular

    quovadis

    Joined:
    Oct 30, 2006
    Location:
    in PA
    #4
    Your question is very insightful - hadn't thought about this. Here is what I do:

    I don't use migration assistant. I have a folder in the "Documents" folder, say folder named "X"
    Before an OS re-install, I copy this folder to an external and after the re-install I copy from the external to the internal hard disk (to the "Documents" folder)

    thanks
     
  5. Consultant macrumors G5

    Consultant

    Joined:
    Jun 27, 2007
    #5
    How long did it took to zero data? Few hours or minutes? Perhaps you didn't actually zero out the disk.
     
  6. quovadis thread starter macrumors regular

    quovadis

    Joined:
    Oct 30, 2006
    Location:
    in PA
    #6
    It took a long time. I don't recall the exact figure but I want to say something like close to an hour
     
  7. darwinian macrumors 6502a

    darwinian

    Joined:
    Jan 4, 2008
    Location:
    In R4, more or less
    #7
    Someone who knows should confirm this, but that sounds funny -- almost like those folder specific settings are in .DS_Store, which I wouldn't have thought.
     

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