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Message: <blockquote data-quote="MacInWin" data-source="post: 1932469" data-attributes="member: 396914">Yes, that is very risky. Just wait until it can be ejected without forcing it. And your last sentence gives a clue. One of the things in the library is a database of all images along with the full history of each image file (original, all edits, changes, exports, etc). So what may well be happening is that the database is being updated after you export a photo to the local drive (I presume you mean export when you said "move.").  So, wait.Another possibility is that Photos is still open when you try to eject the drive. Are you using the "Quit Photos" from the dropdown menu? If you are just clicking on the red "X" then Photos is still open, and using that library.</blockquote>