Trying to wipe HD...says cant unmount disk?

Discussion in 'Mac OS X Lion (10.7)' started by yanksrock100, Mar 30, 2012.

  1. yanksrock100 macrumors 6502a

    yanksrock100

    Joined:
    Oct 30, 2010
    Location:
    San Diego
    #1
    Im going to wipe my HD, and did command+r. It booted into recovery, and I went to disk utility. I went to my HD (hitachi name, 160.04 gb), and pressed erase.
    Then a message popped up saying "cant unmount disk"

    Help? What can I do?

    I sold my Macbook and need to wipe it!

    Thanks
     
  2. nangariel macrumors member

    Joined:
    Oct 18, 2011
    #2
    Boot from a USB stick or a CD/DVD (ideally an OS X installation medium, as it includes Disk Utility you're probably familiar with), you'll be able to format the whole HD then.
     
  3. itickings macrumors 6502a

    itickings

    Joined:
    Apr 14, 2007
    #3

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