So, on those Macs, you should boot from the recovery partition by doing the following: You can turn it off using Startup Security Utility, but that’s beyond the scope of this article. Hold down Command-R and power your Mac on.Release Command-R when you see the Apple logo.
Power on your Mac and keep holding the power button until you see ‘loading startup options’.Type in your username and password if asked.Plug in a disk with a bootable install of macOS on it.On older Macs that don’t have a T2 security chip, boot from an external disk like this: You should now see macOS Utilities from where you can choose Disk Utility and then unmount the volume from there. Click on the Apple menu and choose System Preferences.Click the padlock and type in your admin username and password.Quit System Preferences and restart your Mac.When your Mac restarts, launch Disk Utility and try whatever you were trying to do again.
CANNOT UNMOUNT DISK MAC HOW TO
How to fix it when an external disk won’t unmount Normally, when you see the error message that an external disk can’t be ejected, there is an explanation for why. Usually, there is an application running that uses the volume that you’re trying to eject. Identify which application is using the disk and quit it, then try and eject the disk again.This will override the error and eject the disk, but it may also damage data on it.
If nothing else works, you can use Terminal to unmount a disk.
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