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Press Return and type in your admin password if you’re asked for it.īeing unable to unmount a disk on your Mac can seem like a terrifying and challenging problem to solve.Type: sudo diskutil unmountDisk /dev/disks1.Note the identifier for the disk you want to unmount.Go to Applications > Utilities and launch Terminal, or choose it from the Utilities menu in macOS Utilities in Recovery mode.You still won’t be able to unmount a volume that you have booted from, but you can use it to unmount an external disk or from Recovery mode to unmount your main boot disk. If nothing else works, you can use Terminal to unmount a disk. 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. Usually, there is an application running that uses the volume that you’re trying to eject. ![]() Normally, when you see the error message that an external disk can’t be ejected, there is an explanation for why. #Format wd passport for mac couldnt unmount disk how to#How to fix it when an external disk won’t unmount When your Mac restarts, launch Disk Utility and try whatever you were trying to do again.Quit System Preferences and restart your Mac.Click the padlock and type in your admin username and password. ![]() Click on the Apple menu and choose System Preferences. #Format wd passport for mac couldnt unmount disk install#
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