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MOUNT_NTFS(8) NetBSD System Manager's Manual MOUNT_NTFS(8)
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mount_ntfs -- mount an NTFS file system
mount_ntfs [-a] [-i] [-u uid] [-g gid] [-m mask] special node
The mount_ntfs command attaches the NTFS filesystem residing on the
device special to the global filesystem namespace at the location indi-
cated by node. Both special and node are converted to absolute paths
before use. This command is normally executed by mount(8) at boot time,
but can be used by any user to mount an NTFS file system on any directory
that they own (provided, of course, that they have appropriate access to
the device that contains the file system).
The supported NTFS versions include both NTFS4, as used by Microsoft Win-
dows NT 4.0, and NTFS5, as used by Microsoft Windows 2000 and XP.
The options are as follows:
-a Force behaviour to return MS-DOS 8.3 names also on readdir(3).
-i Make name lookup case insensitive for all names except POSIX
-u uid Set the owner of the files in the file system to uid. The
default owner is the owner of the directory on which the file
system is being mounted.
-g gid Set the group of the files in the file system to gid. The
default group is the group of the directory on which the file
system is being mounted.
Specify the maximum file permissions for files in the file sys-
NTFS file attributes
NTFS file attributes can be accessed in the following way:
`ATTRTYPE' is one of identifier listed in $AttrDef file of volume.
Default is $DATA. `ATTRNAME' is an attribute name. Default is none.
To get volume name (in Unicode):
# cat /mnt/\$Volume:\$VOLUME_NAME
To read directory raw data:
# cat /mnt/foodir:\$INDEX_ROOT:\$I30
Limited support for writing
There is limited writing ability for files. Limitations:
· file must be non-resident
· file must not contain any holes (uninitialized areas)
· file can't be compressed
Note that it's not currently possible to create or remove files on NTFS
Warning: do not mount NTFS filesystems read-write. The write support is
not very useful and is not tested well. It's not safe to write to any
file on NTFS; you might damage the filesystem. Unless you want to debug
NTFS filesystem code, mount the NTFS filesystem read-only.
mount(2), unmount(2), fstab(5), disklabel(8), mbrlabel(8), mount(8)
Support for NTFS first appeared in FreeBSD 3.0. It was ported to NetBSD
and first appeared in NetBSD 1.5.
NTFS kernel implementation, mount_ntfs and this manual were originally
written by Semen Ustimenko <semenu@FreeBSD.org>.
The NetBSD port was done by
Christos Zoulas <christos@NetBSD.org> and
Jaromir Dolecek <jdolecek@NetBSD.org>.
The write support should be enhanced to actually be able to change file
size, and to create and remove files and directories. It's not very use-
ful right now.
If the attempt to mount NTFS gives you an error like this:
# mount -t ntfs /dev/wd0k /mnt
mount_ntfs: /dev/wd0k on /mnt: Invalid argument
make sure that appropriate partition has correct entry in the disk label,
particularly that the partition offset is correct.
Recently many cards (in particular SDXC ones) are formatted using exFAT.
For those cards, disklabel reports NTFS as the partition type. There is
currently no support for mounting exFAT drives.
If the NTFS partition is the first partition on the disk, the offset
should be '63' or '2048' on i386 (see disklabel(8)). exFAT partitions
typically report an offset of '32768'. mbrlabel(8) could help you to set
up the disk label correctly.
If the NTFS partition is marked as `dynamic' under Microsoft Windows XP,
it won't be possible to access it under NetBSD anymore.
NetBSD 9.1 September 9, 2015 NetBSD 9.1