mount_msdosfs -- mount an MS-DOS file system
mount_msdosfs [-o options] [-u uid] [-g gid] [-m mask] [-M mask] [-s]
[-l] [-9] [-L locale] [-D dos-codepage] [-W table] special
The mount_msdosfs utility attaches the MS-DOS file system residing on the
device special to the global file system namespace at the location indicated
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:
Force Windows 95 long filenames to be visible.
Force only the old MS-DOS 8.3 style filenames to be visible.
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 system.
(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 separate
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 remained for backward compatibility purpose, and
will be removed in the future. Please do not use this option.
Specify text file name with conversion table: iso22dos, iso72dos,
To mount a Russian msdos file system located in /dev/ad1s1:
# mount_msdosfs -L ru_RU.KOI8-R -D CP866 /dev/ad1s1 /mnt
To mount a Japanese msdos file system located in /dev/ad1s1:
# mount_msdosfs -L ja_JP.eucJP -D CP932 /dev/ad1s1 /mnt
mount(2), unmount(2), fstab(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
FreeBSD 2.1 and earlier versions could not handle cluster sizes larger
than 16K. Just mounting an MS-DOS file system could cause corruption to
any mounted file system. Cluster sizes larger than 16K are unavoidable
for file system sizes larger than 1G, and also occur when file systems
larger than 1G are shrunk to smaller than 1G using FIPS.
The mount_msdosfs utility first appeared in FreeBSD 2.0. Its predecessor,
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.
FreeBSD 5.2.1 April 7, 1994 FreeBSD 5.2.1 [ Back ]