MOUNT_MSDOS(8) BSD System Manager's Manual MOUNT_MSDOS(8)
mount_msdos - mount an MS-DOS file system
mount_msdos [-o options] [-u uid] [-g gid] [-m mask] [-s] [-l] [-9] [-G] [-x] special node
The mount_msdos command attaches the MS-DOS filesystem residing on the device special to the global filesystem namespace at the location indi- cated by node. This command is invoked by mount(8) when using the syntax mount [options] -t msdos special node The special device must correspond to a partition registered in the disklabel(5). 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: -o options Use the specified mount options, as described in mount(8). -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. -m mask 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 default mask is taken from the directory on which the file system is being mounted. -s Force behaviour to ignore and not generate Windows 95/98 long filenames. -l Force listing and generation of Windows 95/98 long filenames and separate creation/modification/access dates. If neither -s nor -l are given, mount_msdos searches the root directory of the filesystem to be mounted for any existing Win- dows 95/98 long filenames. If no such entries are found, -s is the default. Otherwise -l is assumed. -9 Ignore the special Windows 95/98 directory entries even if delet- ing or renaming a file. This forces -s. -G This option causes the filesystem to be interpreted as an Atari- Gemdos filesystem. The differences to the MS-DOS filesystem are minimal and limited to the boot block. This option enforces -9. -x If a directory is readable, it inherits the x attribute as well.
mount(2), disklabel(5), fstab(5), disklabel(8), mount(8), umount(8)
The mount_msdos utility first appeared in NetBSD 0.9. Its predecessor, the mount_pcfs utility, appeared in NetBSD 0.8, and was abandoned in favor of the more aptly named mount_msdos.
The maximum file size supported by the MS-DOS filesystem is one byte less than 4GB. This is a FAT filesystem limitation, documented by Microsoft in Knowledge Base article 314463. The MS-DOS filesystem (even with long filenames) does not support filenames with trailing dots or spaces. Any such characters will be silently removed before the directory entry is written. This too is a FAT filesystem limitation. The use of the -9 flag could result in damaged filesystems, albeit the damage is in part taken care of by procedures similar to the ones used in Windows 95/98. The default handling for -s and -l will result in empty filesystems being populated with short filenames only. To generate long filenames on empty DOS file systems use -l. Note that Windows 95/98 handles only access dates, but not access times. Due to the German patent 69429378 (EP0618540), long file names are currently not supported at all. Partial support by means of a code rewrite is, however, planned. MirOS BSD #10-current August 14, 2010 1
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