Troubleshooting & messages · Drive connection and drive messages
Why does Eject fast drive say it will quit Xcode, Docker and other apps?
Short answer: Developer tools keep files open on the drive, and macOS can't eject while files are open. So eject pauses automatic actions and asks those apps to quit first — save your work.
Developer tools such as Xcode, Simulator, Docker, OrbStack and JetBrains IDEs often keep files open on the drive (caches, images, simulators). macOS can't eject a drive while files on it are open, so the eject sequence pauses automatic actions, asks those apps to quit, waits a few seconds, then ejects.
Save your work before clicking Eject. If something still holds a file, Storage Studio lists it so you can close it yourself. Click Resume in the popover after reconnecting to turn automatic actions back on.
See the eject guide.