MOUNT_MSDOSFS(8) BSD System Manager's Manual MOUNT_MSDOSFS(8)NAMEmount_msdosfs — mount an MS-DOS file system
SYNOPSISmount_msdosfs [-9ls] [-D DOS_codepage] [-g gid] [-L locale] [-M mask]
[-m mask] [-o options] [-u uid] [-W table] special node
The mount_msdosfs utility attaches the MS-DOS file system residing on the
device special to the global file system namespace at the location indi‐
cated by node. This command is normally executed by mount(8) at boot
time, but can be used by any user to mount an MS-DOS 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 options are as follows:
Use the specified mount options, as described in mount(8). The
following MSDOS file system-specific options are available:
large Support file systems larger than 128 gigabytes at the
expense of 32 bytes of kernel memory for each file on
disk. This memory will not be reclaimed until the file
system has been unmounted.
Force Windows 95 long filenames to be visible.
Force only the old MS-DOS 8.3 style filenames to be visi‐
Completely ignore Windows 95 extended file information.
-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‐
tem. (For example, a mask of 755 specifies that, by default, the
owner should have read, write, and execute permissions for files,
but others should only have read and execute permissions. See
chmod(1) for more information about octal file modes. Only the
nine low-order bits of mask are used. The value of -M is used if
it is supplied and -m is omitted. The default mask is taken from
the directory on which the file system is being mounted.
Specify the maximum file permissions for directories in the file
system. The value of -m is used if it is supplied and -M is
omitted. See the previous option's description for details.
-s Force behaviour to ignore and not generate Win'95 long filenames.
-l Force listing and generation of Win'95 long filenames and sepa‐
rate creation/modification/access dates.
If neither -s nor -l are given, mount_msdosfs searches the root
directory of the file system to be mounted for any existing
Win'95 long filenames. If no such entries are found, but short
DOS filenames are found, -s is the default. Otherwise -l is
-9 Ignore the special Win'95 directory entries even if deleting or
renaming a file. This forces -s.
Specify locale name used for file name conversions for DOS and
Win'95 names. By default ISO 8859-1 assumed as local character
Specify the MS-DOS code page (aka IBM/OEM code page) name used
for file name conversions for DOS names.
This option is preserved for backward compatibility purpose only,
and will be removed in the future. Please avoid using this
Specify text file name with conversion table: iso22dos, iso72dos,
To mount a Russian MS-DOS file system located in /dev/ad1s1:
mount_msdosfs-L ru_RU.KOI8-R -D CP866 /dev/ad1s1 /mnt
To mount a Japanese MS-DOS file system located in /dev/ad1s1:
mount_msdosfs-L ja_JP.eucJP -D CP932 /dev/ad1s1 /mnt
SEE ALSOmount(2), unmount(2), fstab(5), msdosfs(5), mount(8)
List of Localized MS Operating Systems:
The use of the -9 flag could result in damaged file systems, albeit the
damage is in part taken care of by procedures similar to the ones used in
The mount_msdosfs utility first appeared in FreeBSD 2.0. Its predeces‐
sor, the mount_pcfs utility appeared in FreeBSD 1.0, and was abandoned in
favor of the more aptly-named mount_msdosfs.
The character code conversion routine was added by Ryuichiro Imura
⟨email@example.com⟩ at 2003.
BSD December 23, 2008 BSD