Can't eject disk

If a disk can’t be ejected, Merceq often tells you the name of the app using it: “Couldn’t eject disk: {program} is using a file on the disk. Close it and try again.”

1. Close the app named in the message.
2. If a transfer is running in Merceq, wait for it to finish or pause it from Machine.
3. Try Disks → Eject again. If macOS says the disk is still in use, don’t forcefully pull the cable.