- Could not unmount disk external hard drive how to#
- Could not unmount disk external hard drive mac os x#
But before trying this method, make sure that the recovery drive is located in the drive (a separate copy of os installed on it). Assuming that I do a backup at 4am, the first line will mount the disk at 3:59am. 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). 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 first line, disk1s10 with the drive identifier from step one. 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. Using the format option would destroy irreplaceable data and hours upon hours of my students meticulous work. Or go to Erase in order to format the disk. I teach moviemaking and my students work is on the external disk. Step 3: Visit First Aid and try to repair the disk. When a device cannot erase or partition the drive, users are delivered Couldnt Unmount Disk error or related messages. Step 2: A boot menu will appear, here, select to choose “Disk Utility”. vhdx file, click/tap on Open, check or uncheck Read-only, and click/tap on OK. (see screenshot below) 3 Click/tap on Browse, navigate to and select the. Read the Online Manuals and use the forum search feature before posting. 2 Click/tap on Action in the menu bar, and click/tap on Attach VHD. 2 - if a drive is not compatable with the 409 then formatting it will not make it compatable. Step 1: Restart your Mac while pressing and holding the Option key, and then select to choose Recovery partition. 1 - you dont say what your external drives are formatted as.
Could not unmount disk external hard drive how to#
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
Could not unmount disk external hard drive mac os x#
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. 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. Good thing is that a valid solution is available that will help us to resolve the “Couldn’t Unmount Disk” Error on Mac. SEE ALSO iTunes Not Showing Album Artwork? Here's how to fix it.