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RedHat 9 (Linux i386) - man page for mkfs.msdos (redhat section 8)

MKDOSFS(8)			     System Manager's Manual			       MKDOSFS(8)

NAME
       mkdosfs - create an MS-DOS file system under Linux

SYNOPSIS
       mkdosfs [ -A ] [ -b sector-of-backup ] [ -c ] [ -l filename ] [ -C ] [ -f number-of-FATs ]
       [ -F FAT-size ] [ -i volume-id ] [ -I ] [ -m message-file ] [ -n volume-name ] [ -r  root-
       dir-entries  ]  [ -R number-of-reserved-sectors ] [ -s sectors-per-cluster ] [ -S logical-
       sector-size ] [ -v ] device [ block-count ]

DESCRIPTION
       mkdosfs is used to create an MS-DOS file system under Linux on a device	(usually  a  disk
       partition).   device  is  the  special  file  corresponding to the device (e.g /dev/hdXX).
       block-count is the number of blocks on the  device.   If  omitted,  mkdosfs  automatically
       determiness the file system size.

OPTIONS
       -A     Use  Atari variation of the MS-DOS filesystem. This is default if mkdosfs is run on
	      an Atari, then this option turns off Atari format. There are some differences  when
	      using  Atari format: If not directed otherwise by the user, mkdosfs will always use
	      2 sectors per cluster, since GEMDOS doesn't like other values very much.	 It  will
	      also  obey the maximum number of sectors GEMDOS can handle.  Larger filesystems are
	      managed by raising the logical sector size.  Under Atari format, an  Atari-compati-
	      ble  serial  number  for the filesystem is generated, and a 12 bit FAT is used only
	      for filesystems that have one of the usual floppy sizes (720k, 1.2M, 1.44M, 2.88M),
	      a 16 bit FAT otherwise. This can be overridden with the -F option. Some PC-specific
	      boot sector fields aren't written, and a boot message (option -m) is ignored.

       -b sector-of-backup
	      Selects the location of the backup boot sector for FAT32. Default depends on number
	      of  reserved  sectors, but usually is sector 6. The backup must be within the range
	      of reserved sectors.

       -c     Check the device for bad blocks before creating the file system.

       -C     Create the file given as device on the command line, and	write  the  to-be-created
	      file system to it. This can be used to create the new file system in a file instead
	      of on a real device, and to avoid using dd in advance to create a file of appropri-
	      ate  size.  With	this option, the block-count must be given, because otherwise the
	      intended size of the file system wouldn't be known. The file created  is	a  sparse
	      file, which actually only contains the meta-data areas (boot sector, FATs, and root
	      directory). The data portions won't be stored on the disk, but the  file	neverthe-
	      less will have the correct size. The resulting file can be copied later to a floppy
	      disk or other device, or mounted through a loop device.

       -f number-of-FATs
	      Specify the number of file allocation tables in the file system.	The default is 2.
	      Currently the Linux MS-DOS file system does not support more than 2 FATs.

       -F FAT-size
	      Specifies  the  type of file allocation tables used (12, 16 or 32 bit).  If nothing
	      is specified, mkdosfs will automatically select between 12  and  16  bit,  whatever
	      fits  better  for  the  filesystem size.	32 bit FAT (FAT32 format) must (still) be
	      selected explicitly if you want it.

       -i volume-id
	      Sets the volume ID of the newly created filesystem; volume-id is a 32-bit hexadeci-
	      mal  number  (for example, 2e24ec82).  The default is a number which depends on the
	      filesystem creation time.

       -I     Normally you are not allowed to use any 'full' fixed disk  devices.   mkdosfs  will
	      complain	and  tell  you	that it refuses to work.  This is different when usind MO
	      disks.  One doesn't always need partitions on  MO  disks.   The  filesytem  can  go
	      directly	to  the  whole disk.  Under other OSes this is known as the 'superfloppy'
	      format.

	      This switch will force mkdosfs to work properly.

       -l filename
	      Read the bad blocks list from filename.

       -m message-file
	      Sets the message the user receives on attempts to boot this filesystem without hav-
	      ing  properly  installed an operating system.  The message file must not exceed 418
	      bytes once line feeds have been converted to  carriage  return-line  feed  combina-
	      tions,  and  tabs have been expanded.  If the filename is a hyphen (-), the text is
	      taken from standard input.

       -n volume-name
	      Sets the volume name (label) of the filesystem.  The volume name can be  up  to  11
	      characters long.	The default is no label.

       -r root-dir-entries
	      Select  the  number of entries available in the root directory.  The default is 112
	      or 224 for floppies and 512 for hard disks.

       -R number-of-reserved-sectors
	      Select the number of reserved sectos. With FAT32 format at least 2 reserved sectors
	      are needed, the default is 32. Otherwise the default is 1 (only the boot sector).

       -s sectors-per-cluster
	      Specify  the  number of disk sectors per cluster.  Must be a power of 2, i.e. 1, 2,
	      4, 8, ... 128.

       -S logical-sector-size
	      Specify the number of bytes per logical sector.  Must be a power of 2  and  greater
	      than or equal to 512, i.e. 512, 1024, 2048, 4096, 8192, 16384, or 32768.

       -v     Verbose execution.

BUGS
       None   are   know   at	the   moment.	If  you  find  any,  please  report  it  them  to
       <hpa@yggdrasil.com>.  Please include the version number (Yggdrasil 0.3a).

AUTHOR
       Dave Hudson - <dave@humbug.demon.co.uk>;  modified  by  Peter  Anvin  <hpa@yggdrasil.com>.
       Fixes and additions by Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> for Debian/GNU
       Linux.

ACKNOWLEDGEMENTS
       mkdosfs is based on code from mke2fs (written by Remy Card - <card@masi.ibp.fr>) which  is
       itself based on mkfs (written by Linus Torvalds - <torvalds@cs.helsinki.fi>).

SEE ALSO
       dosfsck(8), mkfs(8)

Version 2.x				    5 May 1995				       MKDOSFS(8)


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