cannot delete/unmount old boot volume

Discussion in 'macOS' started by cjoy, Jan 20, 2011.

  1. cjoy, Jan 20, 2011
    Last edited: Jan 20, 2011

    cjoy macrumors member

    Oct 24, 2008
    I've carbon copied my vanilla install of Mac OS X (SL) onto a SSD and can boot using the latter without problems (also when removing the old drive).
    Now I'd like to delete/partition the former startup volume, but DiskUtility wont let me. It fails to unmount the drive.

    Any ideas on how to solve this issue are much appreciated.

    system disk to the rescue - issue resolved
  2. mjsmke macrumors 6502a

    Mar 2, 2010
    Are you sure you have booted from the new drive?

    You could try booting from the install disk then use disk utility from there to erase the old volume.

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