If this happens, we just need to close the file in question and try again eject the disk. If we have any file stored on the disk open in any app, macOS may prevent us from ejecting the disk so we don’t lose any of our data. It means that we are trying to eject the disk that is currently in use. But to my surprise when pressing the ‘eject’ button Finder warns me with the following error message:įor more experienced users, I recommend reading another article about this issue.

After working with an external hard drive (further simply - disk) I want to cleanly unmount it.