Provided by: ntfs-3g_2017.3.23AR.3-3ubuntu1.3_amd64 
NAME
ntfs-3g - Third Generation Read/Write NTFS Driver
SYNOPSIS
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
DESCRIPTION
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
If either Windows is hibernated or its fast restart is enabled, partitions on internal disks are forced
to be mounted in read-only mode.
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.
OPTIONS
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.
umask=value
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 everybody.
fmask=value
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.
dmask=value
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.
usermapping=file-name
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.
permissions
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.
inherit
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 permissions 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.
locale=value
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 visible.
force This option is obsolete. It has been superseded by the recover and norecover options.
recover
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.
norecover
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.
remove_hiberfile
When the NTFS volume is hibernated, a read-write mount is denied and a read-only mount is forced.
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_sys_files
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_hid_files
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'".
hide_dot_files
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.
windows_names
This option prevents files, directories and extended attributes to be created with a name not
allowed by windows, because
- it contains some not allowed character,
- or the last character is a space or a dot,
- or the name is reserved.
The forbidden characters are the nine characters " * / : < > ? \ | and those whose code is less
than 0x20, and the reserved names are CON, PRN, AUX, NUL, COM1..COM9, LPT1..LPT9, with no suffix
or followed by a dot.
Existing such files can still be read (and renamed).
allow_other
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.
max_read=value
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 and on permission checking
errors, when the permissions option is not set and no user mapping file is defined. This option is
on by default, and when set off (through option no_def_opts) ownership and permissions parameters
have to be set.
no_def_opts
By default ntfs-3g acts as if "silent" (ignore permission errors when permissions are not
enabled), "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.
streams_interface=value
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.
user_xattr
Same as streams_interface=xattr.
efs_raw
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.
compression
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.
Currently this is the default option.
nocompression
This option disables creating new transparently compressed files in directories marked for
compression. Existing compressed files can still be read and updated.
big_writes
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.
no_detach
Makes ntfs-3g to not detach from terminal and print some debug output.
USER MAPPING
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.
::S-1-5-21-3141592653-589793238-462643383-10000
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 :
john::S-1-5-21-3141592653-589793238-462643383-1008
mary::S-1-5-21-3141592653-589793238-462643383-1009
:smith:S-1-5-21-3141592653-589793238-462643383-513 ::S-1-5-21-3141592653-589793238-462643383-10000
The utility ntfsusermap may be used to create such a user mapping file.
EXAMPLES
Mount /dev/sda1 to /mnt/windows:
ntfs-3g /dev/sda1 /mnt/windows
or
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
or
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
EXIT CODES
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 page.
KNOWN ISSUES
Please see
http://www.tuxera.com/support/
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
ntfs-3g-devel@lists.sf.net address.
AUTHORS
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 (szaka@tuxera.com).
THANKS
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.
SEE ALSO
ntfs-3g.probe(8), ntfsprogs(8), attr(5), getfattr(1)