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 pressed.
- -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 line.
- -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 command.
- -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 valid.
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 media.
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).