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FILESYSTEMS(5)                      Linux Programmer's Manual                      FILESYSTEMS(5)



NAME
       filesystems  -  Linux file-system types: minix, ext, ext2, ext3, ext4, Reiserfs, XFS, JFS,
       xia, msdos, umsdos, vfat, ntfs, proc, nfs, iso9660, hpfs, sysv, smb, ncpfs

DESCRIPTION
       When, as is customary, the proc file system is mounted on /proc, you can find in the  file
       /proc/filesystems  which  file  systems  your  kernel  currently  supports.  If you need a
       currently unsupported one, insert the corresponding module or recompile the kernel.

       In order to use a file system, you have to mount it; see mount(8).

       Below a short description of a few of the available file systems.

       minix     is the file system used in the Minix operating system, the first  to  run  under
                 Linux.   It  has  a  number  of shortcomings: a 64MB partition size limit, short
                 filenames, a single timestamp, etc.  It remains  useful  for  floppies  and  RAM
                 disks.

       ext       is  an  elaborate  extension  of  the minix file system.  It has been completely
                 superseded by the second version of the extended file system (ext2) and has been
                 removed from the kernel (in 2.1.21).

       ext2      is  the  high performance disk file system used by Linux for fixed disks as well
                 as removable media.   The  second  extended  file  system  was  designed  as  an
                 extension  of  the extended file system (ext).  ext2 offers the best performance
                 (in terms of speed and CPU usage) of the file systems supported under Linux.

       ext3      is a journaling version of the ext2 file system.  It is easy to switch back  and
                 forth between ext2 and ext3.

       ext4      is  a  set of upgrades to ext3 including substantial performance and reliability
                 enhancements, plus large increases in volume, file, and directory size limits.

       Reiserfs  is a journaling file system, designed by Hans Reiser, that was  integrated  into
                 Linux in kernel 2.4.1.

       XFS       is a journaling file system, developed by SGI, that was integrated into Linux in
                 kernel 2.4.20.

       JFS       is a journaling file system, developed by IBM, that was integrated into Linux in
                 kernel 2.4.24.

       xiafs     was  designed  and implemented to be a stable, safe file system by extending the
                 Minix file system code.  It provides the basic most requested  features  without
                 undue  complexity.   The  xia  file  system  is  no longer actively developed or
                 maintained.  It was removed from the kernel in 2.1.21.

       msdos     is the file system used  by  DOS,  Windows,  and  some  OS/2  computers.   msdos
                 filenames can be no longer than 8 characters, followed by an optional period and
                 3 character extension.

       umsdos    is an extended DOS file system used by  Linux.   It  adds  capability  for  long
                 filenames,  UID/GID, POSIX permissions, and special files (devices, named pipes,
                 etc.)  under the DOS file system, without sacrificing compatibility with DOS.

       vfat      is an extended DOS file system used by Microsoft Windows95 and Windows NT.  VFAT
                 adds the capability to use long filenames under the MSDOS file system.

       ntfs      replaces Microsoft Window's FAT file systems (VFAT, FAT32).  It has reliability,
                 performance,  and  space-utilization  enhancements  plus  features  like   ACLs,
                 journaling, encryption, and so on.

       proc      is  a pseudo file system which is used as an interface to kernel data structures
                 rather than reading and interpreting /dev/kmem.  In particular, its files do not
                 take disk space.  See proc(5).

       iso9660   is a CD-ROM file system type conforming to the ISO 9660 standard.

                 High Sierra
                        Linux  supports  High  Sierra, the precursor to the ISO 9660 standard for
                        CD-ROM file systems.  It is automatically recognized within  the  iso9660
                        file-system support under Linux.

                 Rock Ridge
                        Linux  also supports the System Use Sharing Protocol records specified by
                        the Rock Ridge Interchange Protocol.  They are used to  further  describe
                        the  files  in  the  iso9660  file  system  to  a  UNIX host, and provide
                        information such as  long  filenames,  UID/GID,  POSIX  permissions,  and
                        devices.   It  is automatically recognized within the iso9660 file-system
                        support under Linux.

       hpfs      is the High Performance Filesystem, used in OS/2.  This file system is read-only
                 under Linux due to the lack of available documentation.

       sysv      is  an  implementation  of  the  SystemV/Coherent  file  system  for  Linux.  It
                 implements all of Xenix FS, SystemV/386 FS, and Coherent FS.

       nfs       is the network file system used to access disks located on remote computers.

       smb       is a network file system that supports the SMB protocol,  used  by  Windows  for
                 Workgroups, Windows NT, and Lan Manager.

                 To  use  smb  fs,  you  need  a special mount program, which can be found in the
                 ksmbfs  package,  found  at  <ftp://sunsite.unc.edu/pub/Linux/system/Filesystems
                 /smbfs>.

       ncpfs     is a network file system that supports the NCP protocol, used by Novell NetWare.

                 To   use   ncpfs,   you   need   special   programs,   which  can  be  found  at
                 <ftp://linux01.gwdg.de/pub/ncpfs>.

SEE ALSO
       proc(5), fsck(8), mkfs(8), mount(8)

COLOPHON
       This page is part of release 3.53 of the Linux man-pages project.  A  description  of  the
       project,     and    information    about    reporting    bugs,    can    be    found    at
       http://www.kernel.org/doc/man-pages/.



Linux                                       2012-08-05                             FILESYSTEMS(5)

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