Restoring Macbook Air

Discussion in 'OS X Mountain Lion (10.8)' started by Faux Carnival, Jul 27, 2012.

  1. Faux Carnival macrumors 6502a

    Aug 1, 2010
    Hi, I have Windows installed on my Macbook Air.

    I would like to wipe clean everything and restore the computer to its factory settings. (Also remove Windows)

    I booted in recovery mode. I choose my hard disk and when I choose 1 partition, it says

    "Partition failed with the error:

    Couldn't unmount disk."

    What do I do now? Thanks.

    Attached Files:

  2. littledude8209 macrumors regular

    Jun 18, 2009
    This is because the recovery partition is a partition of your main disk. You need to boot from an external disk/usb to be able to completely erase your internal SSD. There are easy ways to make an external Mountain Lion USB. I attatched a link to show you how to do it. Hope that helps!
  3. Faux Carnival thread starter macrumors 6502a

    Aug 1, 2010
    Thank you so much! Will I be able to completely format my HDD with this method?

    And should I use Journaled when formatting?

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