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142 Red Hat Linux Pocket Administrator
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You can mount either MS-DOS, Windows 95/98/ME, or Windows XP, NT, and 2000 partitions used by your Windows operating system onto your Linux file structure, just as you would mount any Linux file system. You only have to specify the file type of vfat for Windows 95/98/ME, and msdos for MS-DOS. Windows XP, NT, and 2000 use the ntfs file type. You may find it convenient to have your Windows partitions automatically mounted when you start up your Linux system. To do this, you need to put an entry for your Windows partitions in your /etc/fstab file and give it the defaults option, or be sure to include an auto option. You make an entry for each Windows partition you want to mount, and then specify the device name for that partition, followed by the directory in which you want to mount it. The /mnt/windows directory would be a logical choice (be sure the windows directory has already been created in /mnt). For a Windows 95/98/ME partition, use the vfat file system type. The next example shows a standard Windows partition entry for an /etc/fstab file. Notice the last entry in the /etc/fstab file example is an entry for mounting a Windows partition. /dev/hda1 /mnt/windows vfat defaults 0 0
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TIP Linux kernel 2.4 systems currently can only reliably mount ntfs file systems (Windows NT, Windows 2000, and Windows XP) as read-only. They cannot write to these partitions, though experimental and unstable support is provided by the 2.5 development kernel and may be incorporated into the 2.6 kernel.
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Your /etc/fstab file may also have entries for two special kernel interface file systems, devpts and tmpfs. Both provide kernel interfaces that are not supported by
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standard devices. The /dev/pts entry mounts a devpts file system for pseudo terminals. The /dev/shm entry mounts the tmpfs file system (also known as shmfs) to implement Linux Virtual Memory, POSIX shared memory maintenance access. This is designed to overcome the 4GB memory limitation on current systems, extending usable memory to 64GB.
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If your /etc/fstab file ever becomes corrupt say, if a line gets deleted accidentally or changed your system 5 will boot into a maintenance mode, giving you read-only access to your partitions. To gain read/write access so you 5 can fix your /etc/fstab file, you have to remount your main partition. The following command performs such an operation:, 5 # mount -n -o remount,rw /
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noauto
File systems listed in the /etc/fstab file are automatically 5 mounted whenever you boot, unless this feature is explicitly turned off with the noauto option. Notice that the CD-ROM 5 and floppy disks in the sample fstab file earlier in this chapter have a noauto option. Also, if you issue a mount -a command, all the file systems without a noauto 5 option are mounted. If you want to make the CD-ROM user-mountable, add the user option.
/dev/hdc /mnt/cdrom iso9660 ro,noauto,user 0 0
TIP The automatic mounting of file systems from
/etc/fstab is actually implemented by executing a 5 mount -a command in the /etc/rc.d/rc.sysinit file that is run whenever you boot. The mount -a command mounts any file system listed in your /etc/fstab file that 5 does not have a noauto option. The umount -a option unmounts the file systems in /etc/fstab (which is executed when you shut down your system). 5
144 Red Hat Linux Pocket Administrator
Mounting File Systems Directly: mount and umount
You can also mount or unmount any file system using the mount and umount commands directly (notice that umount lacks an n). The mount operations discussed in the previous sections use the mount command to mount a file system. Normally, the mounting of file systems on hard disk partitions can only be done as the root user, whereas CD-ROMs and floppies can be mounted by any user. Table 5-3 lists the different options for the mount command.
Mount Options -f Description Fakes the mounting of a file system. Use it to check if a file system can be mounted. Verbose mode. Mmount displays descriptions of the actions it is taking. Use with -f to check for any problems mounting a file system, -fv. Mounts the file system with read/ write permission. Mounts the file system with read-only permission. Mounts the file system without placing an entry for it in the mstab file. Specifies the type of file system to be mounted. See Table 5-1 for valid file system types. Mounts all file systems listed in /etc/fstab. Mounts the file system using a list of options. This is a comma-separated list of options following -o. See Table 5-2 for a list of the options.
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