Yes, this is confusing. Copying readme e. This is sticky. Check your manpage for mtools. I bailed out with a cntl-C command.
Some computers have a button to push to eject, the diskette.
So you push the button and you get your diskette back. Some computers have a button that when you push it, nothing happens. Or they don't have a button at all. See the man page for mtools for a discussion of this. If nothing happens with the eject command, this means that your unix software wants an argument identifying the path to object to be ejected.