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SDB:Mounting, Partitioning, and Configuring File Systems
Version: 1.0 -
Under Linux, several file systems and file system types (e.g.
iso9660) can be combined to form a large overall file system under
Since Linux does not have logical drives such as e.g. in DOS (C:, D:, etc.), this mechanism is necessary. The Linux system regards all physical drives, including hard disks, floppy drives, CD-ROM drives, MO, ZIP drives, etc. as file systems that are integrated in the parent file system
This procedure is called mounting. The act of detaching a file system from the
/ file system is referred to as unmounting.
Prerequisites for including and mounting file systems:
- A known file system must exist on the respective medium (CD, MO, ZIP medium) or partition (hard disk); this corresponds to the formatting process. The file system type must be one that is supported by the command
- There must be a point where the file system can be mounted on the "
/" file system. This point is called mountpoint and is usually an empty directory that needs to be created with
- The type of the file system that is going to be mounted must either be stated together with the command
mountor entered in the file
File systems that are regularly mounted (e.g. when the system is booted) are listed in the file
/etc/fstab, each line representing one file system. For more information on this issue, please check the respective manpages:
man fstab man mount
Accordingly, an entry for an ATAPI CD-ROM drive (master on the second controller) could look as follows:
/dev/hdc /cdrom iso9660 ro,noauto,user 0 0
This allows all users to mount CDs by entering "
mount /cdrom". Please pay attention to the sequence of the file systems in the list. The sequence in the file
/etc/fstab should correspond to the subsequent mounting sequence.
The correct sequence is usually determined by YaST; for example,
/usr/local is mounted after
/usr. The command
mount can not determine the correct sequence and mounts file systems in the order of their appearance in
noauto are interesting for the use of
user allows a file system to be mounted/unmounted by any user (this is especially interesting for the CD-ROM drive).
noauto prevents the indicated partition from being mounted automatically at system start-up (i.e.
mount -a), and requires an explicit manual mount. This is useful for media that may not always be available at system start-up (e.g. CD-ROM).