Not showing internal hard drive

Discussion in 'Mac OS X Lion (10.7)' started by hateloveobey, Sep 13, 2012.

  1. hateloveobey
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    macrumors newbie

    Sep 10, 2012
    Re-installing lion on my MBP but the only options it gives to me where I want it to be installed is the "recovery". On disc utility it does show the 400GB internal harddrive' I tried to erase and make it ''os journeld' but all it says is "unable to unmount"

    Anyway, I am now installing lion on an external hard drive but as soon as its done I want to install mountain lion on the internall hdd, any solutions?
  2. kpgh554
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    macrumors regular

    Dec 29, 2011
    you can't unmount or erase a disc that your running from. use external hdd to erase internal hdd then reinstall.or if have a usb recovery drive can also reinstall afresh from that
  3. killerrobot
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    macrumors 68020


    Jun 7, 2007
    If you have the recovery partition installed on your HDD, just hold down command-r at startup and it will automaticaly boot from the recovery partition allowing you to format and reinstall lion.

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