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Man Pages
MOUNT_MSDOSFS(8) FreeBSD System Manager's Manual MOUNT_MSDOSFS(8)

mount_msdosfs
mount an MS-DOS file system

mount_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 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:
options
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.
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.
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.
mask
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.
mask
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.
Force behaviour to ignore and not generate Win'95 long filenames.
Force listing and generation of Win'95 long filenames and separate creation/modification/access dates.
If neither -s nor -l are given, -l is the default.
Ignore the special Win'95 directory entries even if deleting or renaming a file. This forces -s.
locale
Specify locale name used for file name conversions for DOS and Win'95 names. By default ISO 8859-1 assumed as local character set.
DOS_codepage
Specify the MS-DOS code page (aka IBM/OEM code page) name used for file name conversions for DOS names.
table
This option is preserved for backward compatibility purpose only, and will be removed in the future. Please avoid using this option.
Specify text file name with conversion table: iso22dos, iso72dos, koi2dos, koi8u2dos.

To mount a Russian MS-DOS file system located in /dev/ada1s1:
mount_msdosfs -L ru_RU.KOI8-R -D CP866 /dev/ada1s1 /mnt
To mount a Japanese MS-DOS file system located in /dev/ada1s1:
mount_msdosfs -L ja_JP.eucJP -D CP932 /dev/ada1s1 /mnt

mount(2), unmount(2), fstab(5), msdosfs(5), mount(8)
List of Localized MS Operating Systems: http://www.microsoft.com/globaldev/reference/oslocversion.mspx.

The predecessor to mount_msdos utility named mount_pcfs appeared in NetBSD 0.8. It was rewritten in NetBSD 1.0 and first appeared in FreeBSD 2.0. mount_msdos was renamed to the more aptly-named mount_msdosfs in FreeBSD 5.0. The character code conversion routine was added in 2003.

Initial implementation as mount_pcfs was written by Paul Popelka <paulp@uts.amdahl.com>. It was rewritten by Christopher G. Demetriou <cgd@NetBSD.org>. The character code conversion routine was added by Ryuichiro Imura <imura@ryu16.org>.

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 Win'95.
May 28, 2017 FreeBSD 12.0-RELEASE

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