OS X Mavericks :: Repartition From Recovery Disk / Cannot Unmount Disk.
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OS X :: Disk Utility Error / Disk Could Not Unmount.
#Mac os could not unmount disk mac os x
Intel Mac :: Erase Hard Drive Mac OS X (LION) "Couldn't Unmount Disk".
Intel Mac :: Erase Disk Shows Couldn't Unmount Disk.
MacBook Pro, Mac OS X (10.7.3) View 3 Replies Click the Erase button, a message displayed: Disk Erase failed. Disk Erase failed with the error:Couldn't unmount disk. Holding the Option key when restarting the macbook, and enter the Recovery HD, selecting the Disk Utility. Click the hard disk name, and select Erase tab. MacBook Pro :: Error - Couldn't Unmount Disk Feb 12, 2012