How to Erase Encrypted Backup HD

Discussion in 'Mac Basics and Help' started by ghsNick, Dec 21, 2016.

  1. ghsNick macrumors 68020

    ghsNick

    Joined:
    May 25, 2010
    #1
    Hi -

    I'm trying to erase my backup HDD I was using with Time Machine and it was encrypted...every time I go to erase it in Disk Utility I get the following error message.

    Any idea on how I can erase this thing properly so I can partition?

    Thanks
     

    Attached Files:

  2. KALLT macrumors 601

    Joined:
    Sep 23, 2008
    #3
    Make sure that the disk is not being accessed anywhere, e.g. not in Finder or a Terminal window. Just close these windows. If that does not work, eject the disk and try it again.
     
  3. JohnDS macrumors 65816

    Joined:
    Oct 25, 2015
    #4
    Launch Disk Utility to erase the volume. However, before erasing, you need to select the disk and then choose File > Unlock “volume name”
     

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