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The following example unmounts the floppy disk wherever it is mounted:
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# umount /dev/fd0
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Using the example where the device is mounted on the /mydir directory, you can use that directory to unmount the file system:
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# umount /mydir
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One important constraint applies to the umount command: you can never unmount a file system in which you are currently working If you change to a directory within a file system that you then try to unmount, you receive an error message stating that the file system is busy For example, suppose a CD-ROM is mounted on the /media/disk directory, and then you change to that /media/disk directory If you decide to change CD-ROMs, you first have to unmount the current one with the umount command This will fail because you are currently in the directory in which it is mounted You have to leave that directory before you can unmount the CD-ROM
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# mount /dev/hdc /media/disk # cd /media/disk # umount /media/disk umount: /dev/hdc: device is busy # cd /root # umount /media/disk
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TIP If other users are using a file system you are trying to unmount, you can use the lsof or
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System Administration
Mounting Floppy Disks
As noted previously, to access a file on a floppy disk, the disk first has to be mounted on your Linux system The device name for your floppy drive is fd0, and it is located in the directory /dev Entering /dev/fd0 references your floppy drive Notice the number 0 after fd If you have more than one floppy drive, the additional drives are represented by fd1, fd2, and so on You can mount to any directory you want Some distributions create a convenient directory to use for floppy disks, /media/floppy The following example mounts the floppy disk in your floppy drive to the /media/floppy directory:
# mount /dev/fd0 /media/floppy
TIP On GNOME, you can mount a floppy drive by right-clicking the desktop background to display
the desktop menu and then selecting Floppy in the Disk entry To unmount, right-click the Floppy icon and select Eject from the pop-up menu Remember, you are mounting a particular floppy disk, not the floppy drive You cannot simply remove the floppy disk and put in another one The mount command has attached those files to your main directory tree, and your system expects to find those files on a floppy disk in your floppy drive If you take out the disk and put another one in, you get an error message when you try to access it To change disks, you must first unmount the floppy disk already in your disk drive Then, after putting in the new disk, you must explicitly mount that new disk To do this, use the umount command
# umount /dev/fd0
For the umount or mount operations, you can specify either the directory it is mounted on or the /dev/fd0 device
# umount /media/floppy
You can now remove the floppy disk, put in the new one, and then mount it:
# mount /media/floppy
When you shut down your system, any disk you have mounted is automatically unmounted You do not have to unmount it explicitly
Mounting CD-ROMs
Remember, when you mount a CD-ROM or floppy disk, you cannot then simply remove it to put another one in the drive You first have to unmount it, detaching the file system from the overall directory tree In fact, the CD-ROM drive remains locked until you unmount it Once you unmount a CD-ROM, you can then take it out and put in another one, which you then must mount before you can access it When changing several CD-ROMs or floppy disks, you are continually mounting and unmounting them For a CD-ROM, instead of using the umount command, you can use the eject command with the device name or mountpoint, which will unmount and then eject the CD-ROM from the drive
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File Systems
To mount a CD-ROM, all you have to do is insert it into the drive HAL will detect it and mount it automatically in the /media/disk directory If instead, you want to manually mount the drive from the command line with the mount command, you will have to first decide on a directory to mount it to (create it if it does not exist) The /media/disk directory is created dynamically when a disk is inserted and deleted when the disk is removed To manually mount a disk, use the mount command, the device name, like /dev/cdrom, and the directory it is mounted to
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