![]() ![]() SEE ALSO iTunes Not Showing Album Artwork? Here's how to fix it. Then using terminal, used the following commands to force unmount disk and erase the disk after. Good thing is that a valid solution is available that will help us to resolve the “Couldn’t Unmount Disk” Error on Mac. Open Disk Utility and select View > Show All Devices from the menu bar. A Volume is the partition or section of a drive you store data in. To check for the exact name of the disk: sudo diskutil list. Show All Devices and Erase the Parent Drive By default, Disk Utility only shows the Volumes on your connected drives, rather than the drives themselves. Keeping the fact in mind that Disk Utility able to execute from the external drive, we can use it to boot Mac from another bootable drive. Let there be any Mac OS X version as it doesn’t matter (assuming 10.7 to 10.14 and above), this error can be easily resolved only if Disk utility is present on the drive.Īnyways, let’s head towards the actual fixes. If that’s not the case, this fix is worth trying, here’s how to resolve the error with the recovery partition: Mind you, this fix will not work if the error was caused by modifying the bootable disk while creating a partition or formating.įix “Couldn’t Unmount Disk” Error with Recovery Partition Step 1: Restart your Mac while pressing and holding the Option key, and then select to choose Recovery partition. As a first line step be sure to close all open files and programs. Step 2: A boot menu will appear, here, select to choose “Disk Utility”. Couldnt unmount disk errors usually appear in Disk Utility when the boot drive is busy. Step 3: Visit First Aid and try to repair the disk. ![]() Or go to Erase in order to format the disk. Once the process is finished, check if the issue has resolved. If, however, you get an error like The volume Macintosh. Fix “Couldn’t Unmount Disk” Error with USB Boot Drive If the issue is still there, then assume that the error is caused by modifying the bootable disk. If you see no messages, then you can assume that diskutil hasnt found any errors, and you can move on. If unable to unmount drive on Mac diskutil list then press return and look for the disk identifier and enter the following command with the disk identifier. This fix has worked for many users, so there are high chances that this will work for you as well. But before trying this method, make sure that the recovery drive is located in the drive (a separate copy of os installed on it). ![]()
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