Can't repartition from Disk Utility on Recovery HD

Discussion in 'MacBook' started by tnsmart, Aug 14, 2012.

  1. tnsmart macrumors 6502

    Aug 23, 2008
    I have a MacBook that I am getting ready to sell. It has two partitions on it, the Mac OS X 10.7 one and a Boot Camp one. I am trying to repartition the HD so that it only has a Mac OS X partition on which I will reinstall Lion. When I boot to the Recovery HD and try to do this in Disk Utility, I get the error "Partition failed with the error: Couldn't unmount disk."

    I can no longer boot to the Mac OS X partition as I've already erased it. I've tried using the OS X Recovery Disk Assistant (, but because I created the bootable USB on my MBP running Mountain Lion, I believe it made a Recovery Disk only for ML and I can't not boot my MacBook from it.

    Any ideas? Any help is appreciated. Thanks!
  2. 53kyle macrumors 65816


    Mar 27, 2012
    Sebastopol, CA
    Try selecting your hd (not a partition) and click on the erase tab and erase it (put a name first)

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