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If another user is using a disk you want to eject from Mac

If you want to eject a disk or storage device from your Mac but other people are using it, do any of the following:

Log out the users who are using the disk or storage device, then try to eject the item again.
If you can’t log out a user, log in as that user, then try to eject the item.

See alsoSwitch quickly between users on Mac If an app is using a disk you want to eject from Mac

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