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If you want to replace one mounted file system with another, you must first explicitly unmount the one already mounted. Say you have mounted a floppy disk, and now you want to take it out and put in a new one. You must unmount that floppy disk before you can put in and mount the new one. You unmount a file system with the umount command. The umount command can take as its argument either a device name or the directory where it was mounted. Here is the syntax:
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# umount device-or-mountpoint
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The following example unmounts the floppy disk mounted to the /mydir directory:
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# umount /dev/fd0
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Using the example where the device was mounted on the /mydir directory, you could use that directory to unmount the file system:
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# umount /mydir
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One important constraint occurs on 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 saying the file system is busy. For example, suppose you mount the Red Hat CD-ROM on the /mnt/ cdrom directory and then change to that /mnt/cdrom 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 first have to leave that directory before you can unmount the CD-ROM.
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# mount /dev/hdc /mnt/cdrom # cd /mnt/cdrom # umount /mnt/cdrom umount: /dev/hdd: device is busy # cd /root # umount /mnt/cdrom
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If other users are using a file system you are trying to unmount, you can use the lsof or the fuser commands to find out who they are. If you are unsure of the type of file system that the floppy disk holds, then you can mount it specifying the auto file system type with the -t option. Given the auto file system type, mount will attempt to automatically detect the type of file system on the floppy disk.
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# mount -t auto /dev/fd0 /mydir
Mounting Floppy Disks
To access a file on a floppy disk, you first have to mount that disk onto 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 additional floppy drives, they are represented by fd1, fd2, and so on. You can mount to any directory you want. Red Hat creates a convenient directory to use for floppy disks, /mnt/floppy. The following example mounts the floppy disk in your floppy drive to the /mnt/floppy directory:
# mount /dev/fd0 /mnt/floppy
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. Notice no n is in the umount command.
# umount /dev/fd0
For the umount operation, you can specify either the directory it is mounted on or the /dev/fd0 device.
# umount /mnt/floppy
You can now remove the floppy disk, put in the new one, and then mount it.
# mount /mnt/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
You can also mount CD-ROM disks to your Linux system using the mount command. On Red Hat, the directory /mnt/cdrom has been reserved for CD-ROM file systems. You see an entry for this in the /etc/fstab file. With such an entry, to mount a CD-ROM, all you have to do is enter the command mount and the directory /mnt/cdrom. You needn't specify the device name. Once mounted, you can access the CD-ROM through the /mnt/cdrom directory.
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