Yolinux.com

mkdosfs manpage

Search topic Section
Get manual page for the search topic
List all commands matching the search topic
List all topics in the manpage index

MKDOSFS(8)							    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 ] [ -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-clus-
       ter ] [ -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 logi-
	      cal sector size.	Under Atari format, an Atari-compatible 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  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
	      known. The file created is a sparse file,	 which	actually  only
	      contains the meta-data areas (boot sector, FATs, and root direc-
	      tory). 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
	      filesystem 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 filesystem; volume-id is
	      a	 32-bit	 hexadecimal  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  having properly installed an operating sys-
	      tem.  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 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
       mkdosfs can not create bootable filesystems. 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 ;)

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.

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)
YoLinux.com Home Page
YoLinux Tutorial Index
Privacy Policy | Advertise with us | Feedback Form |
Unauthorized copying or redistribution prohibited.
    Bookmark and Share