Attach the USB boot drive to your Mac, then reboot.
However, the recovery drive or the installer should be in the drive separate from the primary boot disk with the installed OS on it. If you’re trying to modify your boot drive and this error appears, using a USB boot drive is the easiest method to boot your Mac using another hard drive and running your disk utility from that drive. There are several ways you can fix your disk error. Methods to fix ‘couldn’t unmounts disk’ error on your Mac Other reasons that could prompt such an error include: When you delete some of the system data or file accidentally, it can lead to a data loss or getting a faulty disk error. Unintentional or forced data formatting.Human error.This will happen when you try to delete or format data improperly between ongoing operations and this will cause a disk error.This can be due to the software accessing unauthorized websites or making changes to your hard drive without your knowledge. If there’s a malicious software running in the background and damaging your Mac, this might cause such an error when you try to do something on your hard drive. Or because your Mac is trying to access data in a hurry which causes a sudden interruption in the system which can lead to data corruption or data loss. Maybe you’re trying to delete a file that you’ve opened so it can’t process a delete before you close the file. Interrupted reading or writing operations.When your Mac displays this kind of error when using the disk utility, it could be because of:
What causes the ‘couldn’t unmounts disk’ error on Mac?
Partition failed couldnt unmount disk mac how to#
Some common Mac error messages and how to fix them.Methods to fix ‘couldn’t unmounts disk’ error on your Mac.Other reasons that could prompt such an error include:.What causes the ‘couldn’t unmounts disk’ error on Mac?.
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