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MOUNT_MSDOS(8) NetBSD System Manager's Manual MOUNT_MSDOS(8)
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mount_msdos -- mount an MS-DOS file system
mount_msdos [-9GlsU] [-g gid] [-M mask] [-m mask] [-o options]
[-t gmtoff] [-u uid] special node
The mount_msdos command attaches the MS-DOS file system residing on the
device special to the global file system 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 MS-DOS file system on any direc-
tory that they own (provided, of course, that they have appropriate
access to the device that contains the file system).
Support for FAT16 and VFAT32 as well as long file names is available.
The options are as follows:
-9 Ignore the special Win'95 directory entries even if delet-
ing or renaming a file. This forces -s.
-G This option causes the file system to be interpreted as an
Atari-Gemdos file system. The differences to the MS-DOS
file system are minimal and limited to the boot block.
This option also allows mounting X680x0's Human68k flop-
pies. This option enforces -s.
-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.
-l Force listing and generation of Win'95 long filenames and
separate creation/modification/access dates.
If neither -s nor -l are given, mount_msdos searches the
root directory of the file system to be mounted for any
existing Win'95 long filenames. If the file system is not
empty and no such entries are found, -s is the default.
Otherwise -l is assumed.
-U The MS-DOS file system stores filenames in a short version
using 8-bit characters according to some character set and
a long version with 16-bit unicode characters. The default
method to store encoding-agnostic UNIX filenames is to copy
them byte-wise into both fields. This is transparent but
generates wrong unicode characters for anything that is not
ASCII. Setting the -U flag interprets UNIX filenames as
UTF-8 and generates correctly encoded long filenames. This
-M 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.
-m 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.
-o options Use the specified mount options, as described in mount(8).
-s Force behaviour to ignore and not generate Win'95 long
filenames. See also -l.
-t gmtoff Set the time zone offset (in seconds) from UTC to gmtoff,
with positive values indicating east of the Prime Meridian.
If not set, the user's current time zone will be used.
-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.
To remove the 'execute' permission bit for all files, but still keep
directories searchable, use:
mount_msdos -m 0644 -M 0755 /dev/wd0e /msdos
mount(2), unmount(2), fstab(5), mount(8)
The predecessor to mount_msdos utility named mount_pcfs appeared in
NetBSD 0.8. It was abandoned in favour of the more aptly-named
mount_msdos in NetBSD 0.9 and rewritten entirely by NetBSD 1.0.
Initial implementation as mount_pcfs was written by Paul Popelka
<firstname.lastname@example.org>. It was rewritten by Christopher G. Demetriou
Compressed partitions are not supported.
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
NetBSD 9.99 February 12, 2020 NetBSD 9.99