Partion couldnt unmount disk osx12/16/2023 ![]() ![]() 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. The bootcamp assistant had failed halfway through the process, and it could not extend the partition to include the unallocated space ("partition failed"). 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. Set the format type to Mac OS Extended (Journaled. Click on the Erase tab in the DU main window. Along the same lines, if you want to remount a drive you can. For many users, the easiest way to unmount a drive in Mac is to either just drag a volume into the Trash, use the eject keys, disconnect the drive, or use one of the force eject methods. After DU loads select your startup volume (usually Macintosh HD) from the. You can mount and unmount drives, volumes, and disks from the command line of MacOS and Mac OS X. 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 ( ). Select Disk Utility from the main menu and click on the Continue button. ![]() It fails again, but at least shows an error message "Partition Failed. So I reboot, use command-R, choose disk utility and try again as above. This clears user settings from memory and restores certain security features that might have been altered. Very briefly, a couple of seconds, a progress bar appears and goes away. What does ‘couldn’t unmount disk’ mean If you see an error message telling you that macOS couldn’t unmount a disk, it usually means that a process on your Mac is trying to modify your boot disk and can’t because macOS won’t allow the disk that it has booted from to be unmounted. Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. The partition nor the disk are listed in the output of mount. Unmount the disk and all partitions sudo umount /dev/sdb e2fsck -f /dev/sdb1 /dev/sdb1 is in use. I stretch/resize it to the full 999 and click "apply". Even though the disk was unmounted the system complains that its still in used. As far as I know, I didnt see that disk2 in my disk list before. You should see at least two, sometimes three, entries for. If you are running 10.12 or 10.11 this step is not required as the option is not available. Change the view to Show All Devices instead of the default which is Show Only Volumes. In Disk Utility, I found another disk called disk2 and Mac OS X Base System. If you are running macOS 10.13 (High Sierra) or later it is important to change the view in Disk Utility. Using disk utility, I see the partition layout with "Macintosh HD" occupying the expected 320gb. But, when trying to partition, Disk Utility said that it cannot unmount the disk. I thought (perhaps foolishly) that I would be able to increase the partition size from 320 to the 1tb to take advantage of the larger drive. You need to restart your computer from an an external devicepreferably a device that has the Lion Installer on it-if you want to reformat the drive. I removed it, cloned to a 1tb drive (using ddrescue) and put the 1tb drive back into the iMac. Fix couldnt unmount disk 69888 on Mac when erasing or partitioning an external disk 3. I'm working on an iMac (24", early 2008). ![]()
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