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  1. #1

    Member Since
    Sep 05, 2011
    Angry Trouble with MacBook Pro Disk Utility
    I'm trying to repair my 13" MacBook Pro (2009) HD with DU off Snow Leopard DVD. The first time I did repair it said it was successful, but I still couldn't boot up off the hard drive. I ran repair again and now I keep getting error message: "could not unmount disk". Is there a way I can still try to repair or is reinstalling OS inevitable? I do have backup.

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Keller, Texas
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    It sounds like the hard drive may be damaged or failing. You may be faced with changing it out. Since you can't boot from it and now DU refuses to dismount the drive is a good indication that something is wrong with it. Reinstallation of OS X is probably not going to help.

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