Provided by: ntfs-3g_2013.1.13AR.1-2ubuntu2_amd64 bug


       ntfs-3g - Third Generation Read/Write NTFS Driver


       ntfs-3g [-o option[,...]]  volume mount_point
       mount -t ntfs-3g [-o option[,...]]  volume mount_point
       lowntfs-3g [-o option[,...]]  volume mount_point
       mount -t lowntfs-3g [-o option[,...]]  volume mount_point


       ntfs-3g is an NTFS driver, which can create, remove, rename, move files, directories, hard
       links, and streams; it can read and write  files,  including  streams,  sparse  files  and
       transparently  compressed files; it can handle special files like symbolic links, devices,
       and FIFOs; moreover it provides standard management of  file  ownership  and  permissions,
       including POSIX ACLs.

       It  comes in two variants ntfs-3g and lowntfs-3g with a few differences mentioned below in
       relevant options descriptions.

       The volume to be mounted can be either a block device or an image file.

   Windows hibernation and fast restarting
       On computers which can be dual-booted into Windows or Linux, Windows has to be fully  shut
       down  before  booting into Linux, otherwise the NTFS file systems on internal disks may be
       left in an inconsistent state and changes made by Linux may be ignored by Windows.

       So, Windows may not be left  in  hibernation  when  starting  Linux,  in  order  to  avoid
       inconsistencies.  Moreover,  the  fast restart feature available on recent Windows systems
       has to be disabled. This can be achieved  by  issuing  as  an  Administrator  the  Windows
       command which disables both hibernation and fast restarting :

              powercfg /h off

   Access Handling and Security
       By  default,  files  and  directories  are  owned  by  the effective user and group of the
       mounting process, and everybody has full read, write,  execution  and  directory  browsing
       permissions.  You can also assign permissions to a single user by using the uid and/or the
       gid options together with the umask, or fmask and dmask options.

       Doing so, Windows users have full access to the files created by ntfs-3g.

       But, by setting the permissions option, you  can  benefit  from  the  full  ownership  and
       permissions  features  as  defined by POSIX. Moreover, by defining a Windows-to-Linux user
       mapping, the ownerships and permissions are even applied to Windows users and conversely.

       If ntfs-3g is set setuid-root then non-root users will be also able to mount volumes.

   Windows Filename Compatibility
       NTFS supports several filename namespaces: DOS, Win32 and POSIX. While the ntfs-3g  driver
       handles  all  of  them,  it  always  creates  new files in the POSIX namespace for maximum
       portability and interoperability reasons.  This means that filenames  are  case  sensitive
       and  all  characters  are allowed except '/' and '\0'. This is perfectly legal on Windows,
       though some application may get confused. The option windows_names may be  used  to  apply
       Windows restrictions to new file names.

   Alternate Data Streams (ADS)
       NTFS  stores  all  data in streams. Every file has exactly one unnamed data stream and can
       have many named data streams.  The size of a file is the size of its unnamed data  stream.
       By default, ntfs-3g will only read the unnamed data stream.

       By  using  the  options "streams_interface=windows", with the ntfs-3g driver (not possible
       with lowntfs-3g), you will be able to read any named data streams,  simply  by  specifying
       the stream's name after a colon.  For example:

              cat some.mp3:artist

       Named  data  streams  act  like normal files, so you can read from them, write to them and
       even delete them (using rm).  You can list all the  named  data  streams  a  file  has  by
       getting the "ntfs.streams.list" extended attribute.


       Below is a summary of the options that ntfs-3g accepts.

       uid=value and gid=value
              Set  the  owner  and  the group of files and directories. The values are numerical.
              The defaults are the uid and gid of the current process.

              Set the  bitmask of the file and directory permissions that are  not  present.  The
              value  is  given  in  octal.  The  default  value  is  0 which means full access to

              Set the  bitmask of the file permissions that are not present.  The value is  given
              in octal. The default value is 0 which means full access to everybody.

              Set  the   bitmask  of the directory permissions that are not present. The value is
              given in octal. The default value is 0 which means full access to everybody.

              Use  file  file-name  as  the  user   mapping   file   instead   of   the   default
              .NTFS-3G/UserMapping. If file-name defines a full path, the file must be located on
              a partition previously mounted. If it defines a relative path,  it  is  interpreted
              relative to the root of NTFS partition being mounted.

              When a user mapping file is defined, the options uid=, gid=, umask=, fmask=, dmask=
              and silent are ignored.

              Set standard permissions on created files and use standard  access  control.   This
              option is set by default when a user mapping file is present.

       acl    Enable  setting  Posix ACLs on created files and use them for access control.  This
              option is only available on specific builds. It is  set  by  default  when  a  user
              mapping file is present and the permissions mount option is not set.

              When  creating  a  new  file,  set its initial protections according to inheritance
              rules defined in parent directory. These rules deviate from  Posix  specifications,
              but  yield  a  better Windows compatibility. The compression option or a valid user
              mapping file is required for this option to be effective.

       ro     Mount filesystem read-only. Useful if Windows is hibernated  or  the  NTFS  journal
              file is unclean.

              This  option can be useful when wanting a language specific locale environment.  It
              is however discouraged as it leads to files with untranslatable  chars  to  not  be

       force  This  option  is  obsolete.  It  has  been  superseded by the recover and norecover

              Recover and try to mount a partition which was not unmounted properly  by  Windows.
              The Windows logfile is cleared, which may cause inconsistencies.  Currently this is
              the default option.

              Do not try to mount a partition which was not unmounted properly by Windows.

       ignore_case (only with lowntfs-3g)
              Ignore character case when accessing a file (FOO, Foo, foo, etc. designate the same
              file). All files are displayed with lower case in directory listings.

              Unlike  in  case  of  read-only  mount,  the read-write mount is denied if the NTFS
              volume is hibernated. One needs either to resume Windows and shutdown it  properly,
              or  use  this  option  which will remove the Windows hibernation file. Please note,
              this means that the saved Windows session will be completely lost. Use this  option
              under your own responsibility.

       atime, noatime, relatime
              The atime option updates inode access time for each access.

              The  noatime  option  disables  inode  access  time updates which can speed up file
              operations and prevent sleeping (notebook) disks spinning up too often thus  saving
              energy and disk lifetime.

              The  relatime  option  is  very  similar to noatime.  It updates inode access times
              relative to modify or change time.  The access time is only updated if the previous
              access time was earlier than the current modify or change time. Unlike noatime this
              option doesn't break applications that need to know if a file has been  read  since
              the last time it was modified.  This is the default behaviour.

       delay_mtime[= value]
              Only  update  the file modification time and the file change time of a file when it
              is closed or when the indicated delay since the previous update  has  elapsed.  The
              argument is a number of seconds, with a default value of 60.  This is mainly useful
              for big files which are kept open for a long time and written to  without  changing
              their size, such as databases or file system images mounted as loop.

              Show  the  metafiles  in  directory listings. Otherwise the default behaviour is to
              hide the metafiles, which are special files  used  to  store  the  NTFS  structure.
              Please  note that even when this option is specified, "$MFT" may not be visible due
              to a glibc bug.  Furthermore,  irrespectively  of  show_sys_files,  all  files  are
              accessible by name, for example you can always do "ls -l '$UpCase'".

              Hide  the  hidden files and directories in directory listings, the hidden files and
              directories being the ones whose NTFS attribute have  the  hidden  flag  set.   The
              hidden  files  will not be selected when using wildcards in commands, but all files
              and directories remain accessible by full name, for example you can always  display
              the Windows trash bin directory by : "ls -ld '$RECYCLE.BIN'".

              Set  the  hidden flag in the NTFS attribute for created files and directories whose
              first character of the name is a dot. Such files and directories  normally  do  not
              appear  in  directory  listings,  and  when  the  flag is set they do not appear in
              Windows directory displays either.  When a file is renamed or  linked  with  a  new
              name, the hidden flag is adjusted to the latest name.

              This  option prevents files, directories and extended attributes to be created with
              a name not allowed  by  windows,  either  because  it  contains  some  not  allowed
              character  (which are the nine characters " * / : < > ? \ | and those whose code is
              less than 0x20) or because the last character is a space or a  dot.  Existing  such
              files can still be read (and renamed).

              This  option  overrides  the  security  measure restricting file access to the user
              mounting the filesystem. This option is only allowed to root, but this  restriction
              can be overridden by the 'user_allow_other' option in the /etc/fuse.conf file.

              With  this  option  the maximum size of read operations can be set.  The default is
              infinite.  Note that the size of read requests is limited anyway to 32 pages (which
              is 128kbyte on i386).

       silent Do  nothing,  without  returning any error, on chmod and chown operations, when the
              permissions option is not set and no user mapping file is defined. This  option  is
              on by default.

              By  default  ntfs-3g  acts  as  if  "silent"  (ignore  errors  on chmod and chown),
              "allow_other" (allow any user to access files) and "nonempty"  (allow  mounting  on
              non-empty directories) were set, and "no_def_opts" cancels these default options.

              This  option  controls  how  the user can access Alternate Data Streams (ADS) or in
              other words, named data streams. It can be set to, one of none, windows  or  xattr.
              If  the  option  is  set  to  none,  the user will have no access to the named data
              streams. If it is set to windows (not possible with lowntfs-3g), then the user  can
              access  them just like in Windows (eg. cat file:stream). If it's set to xattr, then
              the named data streams are mapped to xattrs and  user  can  manipulate  them  using
              {get,set}fattr utilities. The default is xattr.

              Same as streams_interface=xattr.

              This  option  should  only  be used in backup or restore situation.  It changes the
              apparent size of files and the  behavior  of  read  and  write  operation  so  that
              encrypted   files   can   be  saved  and  restored  without  being  decrypted.  The
              user.ntfs.efsinfo extended attribute has also to be saved and restored for the file
              to be decrypted.

              This  option  enables  creating  new  transparently compressed files in directories
              marked for compression. A directory is marked for compression by setting the bit 11
              (value  0x00000800)  in  its  Windows attribute. In such a directory, new files are
              created compressed and new subdirectories are themselves  marked  for  compression.
              The option and the flag have no effect on existing files.

              This  option  disables  creating  new transparently compressed files in directories
              marked for compression. Existing compressed files can still be  read  and  updated.
              Currently this is the default option.

              This option prevents fuse from splitting write buffers into 4K chunks, enabling big
              write buffers to be transferred from the application in a single step (up  to  some
              system limit, generally 128K bytes).

       debug  Makes ntfs-3g to print a lot of debug output from libntfs-3g and FUSE.

              Makes ntfs-3g to not detach from terminal and print some debug output.


       NTFS uses specific ids to record the ownership of files instead of the uid and gid used by
       Linux. As a consequence a mapping between the ids has to be defined for ownerships  to  be
       recorded into NTFS and recognized.

       By default, this mapping is fetched from the file .NTFS-3G/UserMapping located in the NTFS
       partition. The option usermapping= may be used to define another location. When the option
       permissions is set and no mapping file is found, a default mapping is used.

       Each  line  in  the  user  mapping file defines a mapping. It is organized in three fields
       separated by colons. The first field identifies a uid, the second field identifies  a  gid
       and  the  third  one identifies the corresponding NTFS id, known as a SID. The uid and the
       gid are optional and defining both of them for the same SID is not recommended.

       If no interoperation with Windows is needed, you can use the option permissions to  define
       a  standard  mapping.  Alternately,  you  may  define your own mapping by setting a single
       default mapping with no uid and gid. In both cases, files created on Linux will appear  to
       Windows  as  owned by a foreign user, and files created on Windows will appear to Linux as
       owned by root. Just copy the example below and replace the 9 and 10-digit numbers  by  any
       number not greater than 4294967295. The resulting behavior is the same as the one with the
       option permission set with no ownership option and no user mapping file available.


       If a strong interoperation with Windows is needed, the mapping has to be defined for  each
       user  and  group  known  in both system, and the SIDs used by Windows has to be collected.
       This will lead to a user mapping file like :


       The utility ntfs-3g.usermap may be used to create such a user mapping file.


       Mount /dev/sda1 to /mnt/windows:

              ntfs-3g /dev/sda1 /mnt/windows
              mount -t ntfs-3g /dev/sda1 /mnt/windows

       Mount  the  ntfs  data  partition  /dev/sda3  to /mnt/data with standard Linux permissions
       applied :

              ntfs-3g -o permissions /dev/sda3 /mnt/data
              mount -t ntfs-3g -o permissions /dev/sda3 /mnt/data

       Read-only mount /dev/sda5 to /home/user/mnt and make user with uid 1000 to be the owner of
       all files:

              ntfs-3g /dev/sda5 /home/user/mnt -o ro,uid=1000

       /etc/fstab  entry  for  the above (the sixth and last field has to be zero to avoid a file
       system check at boot time) :

              /dev/sda5 /home/user/mnt ntfs-3g ro,uid=1000 0 0

       Unmount /mnt/windows:

              umount /mnt/windows


       To facilitate the use of the ntfs-3g driver in scripts, an exit code is returned  to  give
       an indication of the mountability status of a volume. Value 0 means success, and all other
       ones mean an error. The unique error codes are documented in the  ntfs-3g.probe(8)  manual


       Please see


       for  common questions and known issues.  If you would find a new one in the latest release
       of the software then please send an email describing it in detail.  You  can  contact  the
       development team on the address.


       ntfs-3g  was  based on and a major improvement to ntfsmount and libntfs which were written
       by Yura Pakhuchiy and the Linux-NTFS team. The improvements were made, the ntfs-3g project
       was initiated and currently led by long time Linux-NTFS team developer Szabolcs Szakacsits


       Several people made heroic efforts, often over five  or  more  years  which  resulted  the
       ntfs-3g  driver.  Most importantly they are Anton Altaparmakov, Jean-Pierre André, Richard
       Russon, Szabolcs  Szakacsits,  Yura  Pakhuchiy,  Yuval  Fledel,  and  the  author  of  the
       groundbreaking FUSE filesystem development framework, Miklos Szeredi.


       ntfs-3g.probe(8), ntfsprogs(8), attr(5), getfattr(1)