Provided by: dosfstools_2.11-2.3ubuntu1_i386 bug


       mkdosfs - create an MS-DOS file system under Linux


       mkdosfs  [ -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-sectors  ]  [  -s  sectors-per-
       cluster ] [ -S logical-sector-size ] [ -v ] device [ block-count ]


       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
       system size.


       -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
              logical 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
              sector  fields aren’t written, and a boot message (option -m) is

       -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

       -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
              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 nevertheless 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 file
              system size.  32 bit FAT (FAT32 format) must (still) be selected
              explicitly if you want it.

       -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

       -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  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.
              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.


       mkdosfs  can  not  create boot-able file systems. This isn’t as easy as
       you might think at first  glance  for  various  reasons  and  has  been
       discussed a lot already.  mkdosfs simply will not support it ;)


       Dave  Hudson  -  <>;  modified  by  Peter  Anvin
       <>.   Fixes   and    additions    by    Roman    Hodek
       <> for Debian/GNU Linux.


       mkdosfs  is  based  on  code  from  mke2fs  (written  by  Remy  Card  -
       <>) which is itself based on  mkfs  (written  by  Linus
       Torvalds - <>).


       dosfsck(8), mkfs(8)