Provided by: eject_2.37.2-4ubuntu3.4_amd64 bug


       eject - eject removable media

       eject [options] device|mountpoint


       eject allows removable media (typically a CD-ROM, floppy disk, tape, JAZ, ZIP or USB disk)
       to be ejected under software control. The command can also control some multi-disc CD-ROM
       changers, the auto-eject feature supported by some devices, and close the disc tray of
       some CD-ROM drives.

       The device corresponding to device or mountpoint is ejected. If no name is specified, the
       default name /dev/cdrom is used. The device may be addressed by device name (e.g., 'sda'),
       device path (e.g., '/dev/sda'), UUID=uuid or LABEL=label tags.

       There are four different methods of ejecting, depending on whether the device is a CD-ROM,
       SCSI device, removable floppy, or tape. By default eject tries all four methods in order
       until it succeeds.

       If a device partition is specified, the whole-disk device is used.

       If the device or a device partition is currently mounted, it is unmounted before ejecting.
       The eject is processed on exclusive open block device file descriptor if --no-unmount or
       --force are not specified.


       -a, --auto on|off
           This option controls the auto-eject mode, supported by some devices. When enabled, the
           drive automatically ejects when the device is closed.

       -c, --changerslot slot
           With this option a CD slot can be selected from an ATAPI/IDE CD-ROM changer. The
           CD-ROM drive cannot be in use (mounted data CD or playing a music CD) for a change
           request to work. Please also note that the first slot of the changer is referred to as
           0, not 1.

       -d, --default
           List the default device name.

       -F, --force
           Force eject, don’t check device type, don’t open device with exclusive lock. The
           successful result may be false positive on non hot-pluggable devices.

       -f, --floppy
           This option specifies that the drive should be ejected using a removable floppy disk
           eject command.

       -h, --help
           Display help text and exit.

       -i, --manualeject on|off
           This option controls locking of the hardware eject button. When enabled, the drive
           will not be ejected when the button is pressed. This is useful when you are carrying a
           laptop in a bag or case and don’t want it to eject if the button is inadvertently

       -M, --no-partitions-unmount
           The option tells eject to not try to unmount other partitions on partitioned devices.
           If another partition is still mounted, the program will not attempt to eject the
           media. It will attempt to unmount only the device or mountpoint given on the command

       -m, --no-unmount
           The option tells eject to not try to unmount at all. If this option is not specified
           than eject opens the device with O_EXCL flag to be sure that the device is not used
           (since v2.35).

       -n, --noop
           With this option the selected device is displayed but no action is performed.

       -p, --proc
           This option allows you to use /proc/mounts instead /etc/mtab. It also passes the -n
           option to umount(8).

       -q, --tape
           This option specifies that the drive should be ejected using a tape drive offline

       -r, --cdrom
           This option specifies that the drive should be ejected using a CDROM eject command.

       -s, --scsi
           This option specifies that the drive should be ejected using SCSI commands.

       -T, --traytoggle
           With this option the drive is given a CD-ROM tray close command if it’s opened, and a
           CD-ROM tray eject command if it’s closed. Not all devices support this command,
           because it uses the above CD-ROM tray close command.

       -t, --trayclose
           With this option the drive is given a CD-ROM tray close command. Not all devices
           support this command.

       -V, --version
           Display version information and exit.

       -v, --verbose
           Run in verbose mode; more information is displayed about what the command is doing.

       -X, --listspeed
           With this option the CD-ROM drive will be probed to detect the available speeds. The
           output is a list of speeds which can be used as an argument of the -x option. This
           only works with Linux 2.6.13 or higher, on previous versions solely the maximum speed
           will be reported. Also note that some drives may not correctly report the speed and
           therefore this option does not work with them.

       -x, --cdspeed speed
           With this option the drive is given a CD-ROM select speed command. The speed argument
           is a number indicating the desired speed (e.g., 8 for 8X speed), or 0 for maximum data
           rate. Not all devices support this command and you can only specify speeds that the
           drive is capable of. Every time the media is changed this option is cleared. This
           option can be used alone, or with the -t and -c options.


       Returns 0 if operation was successful, 1 if operation failed or command syntax was not


       eject only works with devices that support one or more of the four methods of ejecting.
       This includes most CD-ROM drives (IDE, SCSI, and proprietary), some SCSI tape drives, JAZ
       drives, ZIP drives (parallel port, SCSI, and IDE versions), and LS120 removable floppies.
       Users have also reported success with floppy drives on Sun SPARC and Apple Macintosh
       systems. If eject does not work, it is most likely a limitation of the kernel driver for
       the device and not the eject program itself.

       The -r, -s, -f, and -q options allow controlling which methods are used to eject. More
       than one method can be specified. If none of these options are specified, it tries all
       four (this works fine in most cases).

       eject may not always be able to determine if the device is mounted (e.g., if it has
       several names). If the device name is a symbolic link, eject will follow the link and use
       the device that it points to.

       If eject determines that the device can have multiple partitions, it will attempt to
       unmount all mounted partitions of the device before ejecting (see also
       --no-partitions-unmount). If an unmount fails, the program will not attempt to eject the

       You can eject an audio CD. Some CD-ROM drives will refuse to open the tray if the drive is
       empty. Some devices do not support the tray close command.

       If the auto-eject feature is enabled, then the drive will always be ejected after running
       this command. Not all Linux kernel CD-ROM drivers support the auto-eject mode. There is no
       way to find out the state of the auto-eject mode.

       You need appropriate privileges to access the device files. Running as root is required to
       eject some devices (e.g., SCSI devices).


       Jeff Tranter <> - original author, Karel Zak <> and Michal
       Luscon <> - util-linux version.


       findmnt(8), lsblk(8), mount(8), umount(8)


       For bug reports, use the issue tracker at


       The eject command is part of the util-linux package which can be downloaded from Linux
       Kernel Archive <>.