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    Command:

    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
                  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
    
    
    

    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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