$ mount /media/cdrom0
mount: No medium found

$ umount /media/cdrom0
umount: /media/cdrom0 is not mounted (according to mtab)

$ eject -v /media/cdrom0/
eject: device name is `/media/cdrom0'
eject: expanded name is `/media/cdrom0'
eject: `/media/cdrom0' is not mounted
eject: `/dev/hdc' can be mounted at `/media/cdrom0'
eject: `/dev/hdc' is a multipartition device
eject: trying to eject `/dev/hdc' using CD-ROM eject command
eject: CD-ROM eject command failed
eject: trying to eject `/dev/hdc' using SCSI commands
eject: SCSI eject succeeded