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  1. #1

    Member Since
    Jul 14, 2013
    Unhappy Could not unmount disk: reinstallation
    Trying to reinstall Mountain Lion on my mac mini.. i have the disk and all, but when i'm selecting my drive, and click to continue. it stops me with the ugly message. COULD NOT UNMOUNT Disk...

    WHY .. please?

  2. #2

    Dysfunction's Avatar
    Member Since
    Mar 17, 2008
    Tucson, AZ
    Way... way too many specs to list.
    Did you boot from it?
    This machine kills fascists
    Got # ? phear the command line!

  3. #3

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Nambucca Heads Australia
    iMac i5 2.7GHz, 16GB memory, OS 10.11
    G'day and welcome to the forums.

    A Mountain Lion disc? Where did you get that as only available as a download.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

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