MOUNT_PCFS(8) Maintenance Commands and Procedures MOUNT_PCFS(8)


mount_pcfs - mount pcfs file systems


mount -F pcfs [generic_options]
[-o FSType-specific_options] special | mount_point

mount -F pcfs [generic_options]
[-o FSType-specific_options] special mount_point


mount attaches an MS-DOS file system (pcfs) to the file system hierarchy
at the mount_point, which is the pathname of a directory. If mount_point
has any contents prior to the mount operation, these are hidden until the
file system is unmounted.

The pcfs file system supports direct mounting of files containing the
file system as well as block devices. See mount(8) and lofiadm(8).

If mount is invoked with special or mount_point as the only arguments,
mount will search /etc/vfstab to fill in the missing arguments, including
the FSType-specific_options; see mount(8) for more details.

The special argument can be one of two special device file types:

o A floppy disk, such as /dev/diskette0 or /dev/diskette1.

o A DOS logical drive on a hard disk expressed as device-
name:logical-drive, where device-name specifies the special
block device-file for the whole disk and logical-drive is
either a drive letter (c through z) or a drive number (1
through 24). Examples are /dev/dsk/c0t0d0p0:c and

The special device file type must have a formatted MS-DOS file system
with either a 12-bit, 16-bit, or 32-bit File Allocation Table.



See mount(8) for the list of supported options.


Specify pcfs file system-specific options. The following options are

clamptime | noclamptime

File timestamps in pcfs cover a range between January 1st 1980
and December 31st 2127. This is not equal to the range of time_t
on Unix for either 32-bit or 64-bit applications. In particular,
32-bit applications fail with EOVERFLOW errors on the stat(2)
system call when timestamps beyond the range of 32-bit time_t are
encountered. In order to prevent such spurious failures, pcfs by
default clamps timestamps to the common subset of possible pcfs
timestamps and the range available to 32-bit applications in
Unix. The clamptime mount option therefore is active by default.
If you want access to the full range of possible timestamps on
pcfs, mount the file system with the noclamptime mount option.
Note that if noclamptime is used, only 64-bit applications will
have access to timestamps beyond January 19th 2038, 03:14:06 UTC;
32-bit applications will encounter EOVERFLOW errors.

foldcase | nofoldcase

Force uppercase characters in filenames to lowercase when reading
them from the filesystem. This is for compatibility with the
previous behavior of pcfs. The default is nofoldcase.

hidden | nohidden

Allow or disallow listing of files with hidden or system bits
set. Option hidden is the default. When nohidden is effect,
hidden and system files are neither visible nor accessible. Note
that PCFS in previous releases of the Solaris operating system
used the nohidden option as the default.

atime | noatime

Enable or disable write access timestamps on DOS-formatted media.
Default for fixed disks is atime, while for removable media
noatime is used. The latter default is so that writes to flash-
based media ("memory sticks") can be minimized, to prolong


Timestamps on DOS-formatted media are recorded in the local time
of the recording system. This can cause confusion when accessing
removable media in which the recording and receiving system use
different time zones. Use this option to force media timestamps
to be interpreted for a specific time zone. The mount_pcfs
command converts the given time zone name into a numerical offset
that is passed to the pcfs kernel module, using the same rules as
described in environ(7) for the TZ environment variable. By
default, the timezone value is taken from the TZ environment



table of mounted file systems


list of default parameters for each file system


mount(2), stat(2), time(2), pcfs(4FS), mnttab(5), vfstab(5),
attributes(7), environ(7), lofiadm(8), mount(8), mountall(8)


If the directory on which a file system is to be mounted is a symbolic
link, the file system is mounted on the directory to which the symbolic
link refers, rather than on top of the symbolic link itself.

illumos February 17, 2023 MOUNT_PCFS(8)