Can't unmount disk problem?

Discussion in 'MacBook Pro' started by UsuallyWindows, Jan 12, 2017.

  1. UsuallyWindows macrumors newbie

    Joined:
    Jan 12, 2017
    #1
    I am trying to erase my Macintosh HD but I keep getting a error saying I can't unmount the disk. I am booting up from the install CD so IDK what the problem is
     
  2. BrianBaughn macrumors 601

    BrianBaughn

    Joined:
    Feb 13, 2011
    Location:
    Baltimore, Maryland
    #2
    Sometimes it indicates that there's some process using the disk...which is odd but happens.

    Search for how to use Terminal to force unmount a disk.
     
  3. ihatetoregister macrumors 6502

    ihatetoregister

    Joined:
    Sep 13, 2016
    Location:
    Oslo, Norway
    #3
    Exactly what BrianBaughn says : Check if you have a program still accessing it (anything from finder to 3rd party program to Time Machine encrypting your disk etc).
    In activity monitor you can force close a program that can't be stopped FYI.
     

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