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. Fix “Couldn’t Unmount Disk” Error with Recovery Partition Could not unmount disk external hard drive mac os x# 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. Could not unmount disk external hard drive how to# 1 - you dont say what your external drives are formatted as. Step 1: Restart your Mac while pressing and holding the Option key, and then select to choose Recovery partition. 2 - if a drive is not compatable with the 409 then formatting it will not make it compatable. 2 Click/tap on Action in the menu bar, and click/tap on Attach VHD. Read the Online Manuals and use the forum search feature before posting. (see screenshot below) 3 Click/tap on Browse, navigate to and select the. vhdx file, click/tap on Open, check or uncheck Read-only, and click/tap on OK. Step 2: A boot menu will appear, here, select to choose “Disk Utility”. When a device cannot erase or partition the drive, users are delivered Couldnt Unmount Disk error or related messages. Step 3: Visit First Aid and try to repair the disk. I teach moviemaking and my students work is on the external disk. Or go to Erase in order to format the disk. Using the format option would destroy irreplaceable data and hours upon hours of my students meticulous work. Once the process is finished, check if the issue has resolved. 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. Replace the end of the first line, disk1s10 with the drive identifier from step one. This fix has worked for many users, so there are high chances that this will work for you as well. Replace the end of the second line, /Volumes/The Annex with /Volumes/name of your backup hard drive (the quotes will handle any spaces in the drives name). Assuming that I do a backup at 4am, the first line will mount the disk at 3:59am.
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