mkdosfs


SYNOPSIS
       mkdosfs|mkfs.msdos|mkfs.vfat [ -a ] [ -A ] [ -b sector-of-backup ] [ -c
       ] [ -l filename ] [ -C ] [ -f number-of-FATs ] [ -F  FAT-size  ]  [  -h
       number-of-hidden-sectors  ] [ -i volume-id ] [ -I ] [ -m message-file ]
       [ -n volume-name ] [ -r root-dir-entries ] [ -R number-of-reserved-sec-
       tors  ]  [  -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 determines the file sys-
       tem size.

OPTIONS
       -a     Normally, for any filesystem except  very  small  ones,  mkdosfs
              will align all the data structures to cluster size, to make sure
              that as long as the partition is properly aligned, so  will  all
              the  data  structures  in  the filesystem.  This option disables
              alignment; this may provide a handful of additional clusters  of
              storage  at the expense of a significant performance degradation
              on RAIDs, flash media or large-sector hard disks.

       -A     Use Atari variation of the MS-DOS file system. 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 file systems are managed by raising the log-
              ical  sector  size.   Under  Atari  format,  an Atari-compatible
              serial number for the file system is generated, and a 12 bit FAT
              is  used only for file systems 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 sec-
              tor 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 sec-
              tors.

       -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 appropriate
              size. With this option, the block-count must be  given,  because
              otherwise  the  intended  size  of  the  file system wouldn't be

       -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, 16 and 32 bit, whatever fits better for the
              file system size.

       -h number-of-hidden-sectors
              Select the number of hidden sectors in  the  volume.  Apparently
              some  digital cameras get indigestion if you feed them a CF card
              without such hidden sectors, this option allows you  to  satisfy
              them. Assumes '0' if no value is given on the command line.

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

       -I     It is typical for fixed disk devices to be  partitioned  so,  by
              default, you are not permitted to create a filesystem across the
              entire device.  mkdosfs will  complain  and  tell  you  that  it
              refuses  to  work.   This is different when using MO disks.  One
              doesn't always need partitions on MO disks.  The file system 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 file
              system  without  having  properly installed an operating system.
              The message file must not exceed 418 bytes once line feeds  have
              been  converted  to  carriage return-line feed combinations, 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 file system.  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  sectors. With FAT32 format at
              least 2 reserved sectors are needed, the default is  32.  Other-
              wise the default is 1 (only the boot sector).

       -s sectors-per-cluster
              Specify the number of disk sectors per cluster.  Must be a power

       cussed a lot already.  mkdosfs simply will not support it ;)

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

ACKNOWLEDGMENTS
       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), dosfslabel(8), mkfs(8)



Version 2.x                       5 May 1995                        MKDOSFS(8)
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