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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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TIP If other users are using a file system you are trying
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to unmount, you can use the lsof or fuser commands to find out who they are.
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Mounting Floppy Disks
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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, 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
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TIP On Gnome, you can mount a floppy drive by right- 5 clicking on the desktop background to display the desktop menu and then selecting Floppy in the Disk entry. To 5 unmount, right-click on the Floppy icon and select Eject from the pop-up menu.
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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
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148 Red Hat Linux Pocket Administrator
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 /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
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 mount point, which will unmount and then eject the CD-ROM from the drive. You can also mount CD-ROM disks to your Linux system using the mount command. On many distributions, the directory /mnt/cdrom has been reserved for CD-ROM file systems. You can see an entry for this in the /etc/ fstab file presented earlier in the chapter. 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. # mount /mnt/cdrom
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TIP On Gnome, CD-ROMs are automatically mounted, though you can manually mount them by right-clicking the desktop background to display the desktop menu, and then selecting CD-ROM in the Disk entry. To unmount, right-click on the CD-ROM icon and select Eject from the pop-up menu.
As with floppy disks, you have to unmount one CD-ROM before you can mount another. Use the umount command to unmount the CD-ROM. The CD-ROM will remain locked until you unmount it. # umount /mnt/cdrom If you want to mount a CD-ROM to another directory, you have to include the device name in the mount command. The following example mounts the disc in your CD-ROM drive to the /mydir directory. The particular device name for the CD-ROM in this example is /dev/hdc. # mount /dev/hdc /mydir
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When you burn a CD, you may need to create a CD image file. You could access such an image file from your hard 5 drive, mounting it as if it were another file system (even ripped images could be mounted in this way). For this you use the loop option, specifying an open loop device such 5 as /dev/loop0. If no loop device is indicated, mount will try to find an open one. The file system type is iso9660, a 5 CD-ROM iso image file type.
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