![]() But before trying this method, make sure that the recovery drive is located in the drive (a separate copy of os installed on it). This fix has worked for many users, so there are high chances that this will work for you as well. 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. Once the process is finished, check if the issue has resolved. As a first line step be sure to close all open files and programs. Or go to Erase in order to format the disk. 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. Step 2: A boot menu will appear, here, select to choose “Disk Utility”. Step 1: Restart your Mac while pressing and holding the Option key, and then select to choose Recovery partition. 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. Fix “Couldn’t Unmount Disk” Error with Recovery Partition But I have been suffering from not finding the specific plugin path and. 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. 1 Installing Mac agents to remote office computers can be done easily through. ![]() The command sudo diskutil unmountDisk force /devdisk0 failed because at least one volume could not be unmounted. ![]() ![]() The diskutil list command brought up just /dev/disk0 (plus disk0s1, disk0s2 and disk0s3). 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. Trying to erase my hard drive and it won’t unmount: Disk erase failed. Therefore, if running First Aid on Macintosh HD failed or Macintosh HD could not be repaired in Disk Utility, you can also run FSCK command to repair the. First Aid in Apples Disk Utility is a small utility designed to verify and fix minor problems of a drive. Good thing is that a valid solution is available that will help us to resolve the “Couldn’t Unmount Disk” Error on Mac. 'First Aid could not unmount the volume for repair. SEE ALSO iTunes Not Showing Album Artwork? Here's how to fix it. ![]()
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