eject
eject removable media
see also :
mount - umount
Synopsis
eject -h
eject [-vnrsfmqp] [<name>]
eject [-vn] -d
eject [-vn] -a on|off|1|0 [<name>]
eject [-vn] -c slot [<name>]
eject [-vn] -i on|off|1|0 [<name>]
eject [-vn] -t [<name>]
eject [-vn] -T [<name>]
eject [-vn] -x <speed> [<name>]
eject [-vn] -X [<name>]
eject -V
add an example, a script, a trick and tips
examples
Eject the default device:
eject
Eject a device or mount point named cdrom:
eject cdrom
Eject using device name:
eject /dev/cdrom
Eject using mount point:
eject /mnt/cdrom/
Eject 4th IDE device:
eject hdd
Eject first SCSI device:
eject sda
Eject using SCSI partition name (e.g. a ZIP drive):
eject sda4
Select 5th disc on multi-disc changer:
eject -v -c4 /dev/cdrom
Turn on auto-eject on a SoundBlaster CD-ROM drive:
eject -a on /dev/sbpcd
source
while [
1 = 1]
do
eject
eject -t
source
Ejecting SATA device in Linux
The solution is to spin down the drive via software before
turning it off and unplugging it. The best way to do this is with
a utility called scsiadd. This program can add and remove drives
to Linux’s SCSI subsystem. Additionally, with fairly modern
kernels, removing a device will issue a stop command, which is
exactly what we’re looking for.
Run:
$ sudo scsiadd -p
which should print something like:
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: SAMSUNG HD300LJ Rev: ZT10
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi4 Channel: 00 Id: 00 Lun: 00
Vendor: LITE-ON Model: DVDRW LH-20A1L Rev: BL05
Type: CD-ROM ANSI SCSI revision: 05
Host: scsi5 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: WDC WD10EACS-00Z Rev: 01.0
Type: Direct-Access ANSI SCSI revision: 05
Identify the drive you want to remove and then issue:
$ sudo scsiadd -r host channel id lun
substituting the corresponding values from the scsiadd -p output.
For example, if I wanted to remove “WDC WD10EACS-00Z”, I would
run:
$ sync & sudo scsiadd -r 5 0 0 0
If everything works, scsiadd should print:
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: SAMSUNG HD300LJ Rev: ZT10
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi4 Channel: 00 Id: 00 Lun: 00
Vendor: LITE-ON Model: DVDRW LH-20A1L Rev: BL05
Type: CD-ROM ANSI SCSI revision: 05
You can double-check the end of dmesg. You should see:
[608188.235216] sd 5:0:0:0: [sdb] Synchronizing SCSI cache
[608188.235362] sd 5:0:0:0: [sdb] Stopping disk
[608188.794296] ata6.00: disabled
At this point, the drive is removed from Linux’s SCSI subsystem
and it should not be spinning. It’s safe to unplug and turn off.
source
Cannot mount USB after unsafe eject
Depending on what you want to do, you have a few options.
You can erase the content of the device and start again:
sudo mkfs.vfat -I /dev/sdb
sudo hdparm -z /dev/sdb
mkdir /tmp/x
sudo mount /dev/sdb /tmp/x
You can try checking the file system on /dev/sdb1,
but based on comments from the op, it looks like it's a cdrom
image, so it's read-only.
description
Eject
allows removable media (typically a CD-ROM, floppy disk,
tape, or JAZ or ZIP 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 <name> is ejected. The name can be a
device file or mount point, either a full path or with the
leading "/dev", "/media" or
"/mnt" omitted. If no name is specified, the
default name "cdrom" is used.
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 the device
is currently mounted, it is unmounted before ejecting.
command line options
-h
This option causes eject to display a brief description of
the command options.
-v
This makes eject run in verbose mode; more information is
displayed about what the command is doing.
-d
If invoked with this option, eject lists the default
device name.
-a on|1|off|0
This option controls the auto-eject mode, supported by some
devices. When enabled, the drive automatically ejects when the
device is closed.
-c <slot>
With this option a CD slot can be selected from an ATAPI/IDE
CD-ROM changer. Linux 2.0 or higher is required to use this
feature. The CD-ROM drive can not 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.
-i on|1|off|0
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.
-t
With this option the drive is given a CD-ROM tray close command.
Not all devices support this command.
-T
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.
-x <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.
-X
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 drive may not correctly
report the speed and therefore this option does not work with
them.
-n
With this option the selected device is displayed but no action
is performed.
-r
This option specifies that the drive should be ejected using a
CDROM eject command.
-s
This option specifies that the drive should be ejected using SCSI
commands.
-f
This option specifies that the drive should be ejected using a
removable floppy disk eject command.
-q
This option specifies that the drive should be ejected using a
tape drive offline command.
-p
This option allow you to use /proc/mounts instead /etc/mtab. It
also passes the -n option to umount(1).
-m
This option allows eject to work with device drivers which
automatically mount removable media and therefore must be always
mount(1)ed. The option tells eject to not try to unmount the
given device, even if it is mounted according to /etc/mtab or
/proc/mounts.
-V
This option causes eject to display the program version
and exit.
exit status
Returns 0 if operation was successful, 1 if operation failed or
command syntax was not valid.
long options
All options have corresponding long names, as listed below. The
long names can be abbreviated as long as they are unique.
-h --help
-v --verbose
-d --default
-a --auto
-c --changerslot
-t --trayclose
-T --traytoggle
-x --cdspeed
-X --listspeed
-n --noop
-r --cdrom
-s --scsi
-f --floppy
-q --tape
-V --version
-p --proc
-m --no-unmount
notes
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. 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 or setuid root is required to eject some devices
(e.g. SCSI devices).
The heuristic used to find a device, given a name, is as follows.
If the name ends in a trailing slash, it is removed (this is to
support filenames generated using shell file name completion). If
the name starts with ’.’ or ’/’, it tries to open it as a device
file or mount point. If that fails, it tries prepending ’/dev/’,
’/media/’ ,’/mnt/’, ’/dev/cdroms’, ’/dev/rdsk/’, ’/dev/dsk/’, and
finally ’./’ to the name, until a device file or mount point is
found that can be opened. The program checks /etc/mtab for
mounted devices. If that fails, it also checks /etc/fstab for
mount points of currently unmounted devices.
Creating symbolic links such as /dev/cdrom or /dev/zip is
recommended so that eject can determine the appropriate
devices using easily remembered names.
To save typing you can create a shell alias for the eject options
that work for your particular setup.
see also
mount ,
umount , mount, umount
/usr/src/linux/Documentation/cdrom/
author
Eject
was written by Jeff Tranter (tranter[:at:]pobox[:dot:]com) and is
released under the conditions of the GNU General Public
License. See the file COPYING and notes in the source code
for details.
The -x
option was added by Nobuyuki Tsuchimura
(tutimura[:at:]nn.iij4u.or[:dot:]jp), with thanks to Roland Krivanek
(krivanek[:at:]fmph.uniba[:dot:]sk) and his cdrom_speed command.
The -T
option was added by Sybren Stuvel (sybren[:at:]thirdtower[:dot:]com),
with big thanks to Benjamin Schwenk
(benjaminschwenk[:at:]yahoo[:dot:]de).
The -X
option was added by Eric Piel
(Eric.Piel@tremplin-utc.net).