I hope my explanation is useful to someone with the same problem. Thank you all very much! Your comments were really helpful. So I assume that if you boot from this recovery partition on the drive, it cannot do this part, and the process fails. I think the error "couldnt unmount disk" was due to the fact that somewhere in the process it said it was trying to "relocate the recovery partition". This would let the errors be repaired, but still I would get the error " Disk Erase failed with the error: couldn't unmount disk" when I was trying to resize the partition to include the unallocated space.Ģ) So Finally, when booting from the recovery USB stick, and using Disk Utility, I was able to resize the main partition to the full size of the hard drive. It had also created errors on my main Mac volume (when scanning with Disk Utility).ġ) The Disk Utility inside Mac OS was not able to repair the volume, so I had to boot from the recovery partition (cmd + r during boot), and then repair them. but your PCs drive cannot read the Scarlet Book (SACD) layer. The bootcamp assistant had failed halfway through the process, and it could not extend the partition to include the unallocated space ("partition failed"). Super Audio CD ( SACD) is an optical disc format for audio storage introduced in 1999. That way you have TWO copies of important files. Use it as a backup of the NEW hard drive. Now, re-initialize the original problem drive. Copy all your files from the problem drive to the second one. I had removed bootcamp and the associated partition from my Macbook Pro running Mountain Lion, and I wanted to reallocate that space on the hard drive to my main Mac partition. When it DOES mount, connect the SECOND hard drive. I had a similar problem as the thread starter, and was able to fix it by making a bootable Mountain Lion Recovery Volume on a USB stick, as Courcoul suggested above ( ).
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