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199 lines
5.7 KiB
Groff
199 lines
5.7 KiB
Groff
![]() |
.\" -*- nroff -*-
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.TH MKDOSFS 8 "5 May 1995" "Version 2.x"
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.SH NAME
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.B mkdosfs
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\- create an MS-DOS file system under Linux
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.SH SYNOPSIS
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.B mkdosfs
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[
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.B \-A
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]
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[
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.B \-b
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.I sector-of-backup
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]
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[
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.B \-c
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]
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[
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.B \-l
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.I filename
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]
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[
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.B \-C
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]
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[
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.B \-f
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.I number-of-FATs
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]
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[
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.B \-F
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.I FAT-size
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]
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[
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.B \-i
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.I volume-id
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]
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.RB [ " \-I " ]
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[
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.B \-m
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.I message-file
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]
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[
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.B \-n
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.I volume-name
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]
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[
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.B \-r
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.I root-dir-entries
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]
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[
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.B \-R
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.I number-of-reserved-sectors
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]
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[
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.B \-s
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.I sectors-per-cluster
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]
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[
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.B \-S
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.I logical-sector-size
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]
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[
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.B \-v
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]
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.I device
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[
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.I block-count
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]
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.SH DESCRIPTION
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.B mkdosfs
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is used to create an MS-DOS file system under Linux on a device (usually
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a disk partition).
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.I device
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is the special file corresponding to the device (e.g /dev/hdXX).
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.I block-count
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is the number of blocks on the device. If omitted,
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.B mkdosfs
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automatically determiness the file system size.
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.SH OPTIONS
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.TP
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.B \-A
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Use Atari variation of the MS-DOS filesystem. This is default if
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\fBmkdosfs\fP is run on an Atari, then this option turns off Atari
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format. There are some differences when using Atari format: If not
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directed otherwise by the user, \fBmkdosfs\fP will always use 2
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sectors per cluster, since GEMDOS doesn't like other values very much.
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It will also obey the maximum number of sectors GEMDOS can handle.
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Larger filesystems are managed by raising the logical sector size.
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Under Atari format, an Atari-compatible serial number for the
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filesystem is generated, and a 12 bit FAT is used only for filesystems
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that have one of the usual floppy sizes (720k, 1.2M, 1.44M, 2.88M), a
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16 bit FAT otherwise. This can be overridden with the \fB\-F\fP
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option. Some PC-specific boot sector fields aren't written, and a boot
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message (option \fB\-m\fP) is ignored.
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.TP
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.BI \-b " sector-of-backup "
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Selects the location of the backup boot sector for FAT32. Default
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depends on number of reserved sectors, but usually is sector 6. The
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backup must be within the range of reserved sectors.
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.TP
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.B \-c
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Check the device for bad blocks before creating the file system.
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.TP
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.B \-C
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Create the file given as \fIdevice\fP on the command line, and write
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the to-be-created file system to it. This can be used to create the
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new file system in a file instead of on a real device, and to avoid
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using \fBdd\fP in advance to create a file of appropriate size. With
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this option, the \fIblock-count\fP must be given, because otherwise
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the intended size of the file system wouldn't be known. The file
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created is a sparse file, which actually only contains the meta-data
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areas (boot sector, FATs, and root directory). The data portions won't
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be stored on the disk, but the file nevertheless will have the
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correct size. The resulting file can be copied later to a floppy disk
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or other device, or mounted through a loop device.
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.TP
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.BI \-f " number-of-FATs"
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Specify the number of file allocation tables in the file system. The
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default is 2. Currently the Linux MS-DOS file system does not support
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more than 2 FATs.
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.TP
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.BI \-F " FAT-size"
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Specifies the type of file allocation tables used (12, 16 or 32 bit).
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If nothing is specified, \fBmkdosfs\fR will automatically select
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between 12 and 16 bit, whatever fits better for the filesystem size.
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32 bit FAT (FAT32 format) must (still) be selected explicitly if you
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want it.
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.TP
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.BI \-i " volume-id"
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Sets the volume ID of the newly created filesystem;
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.I volume-id
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is a 32-bit hexadecimal number (for example, 2e24ec82). The default
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is a number which depends on the filesystem creation time.
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.TP
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.B \-I
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Normally you are not allowed to use any 'full' fixed disk devices.
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.B mkdosfs
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will complain and tell you that it refuses to work. This is different
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when usind MO disks. One doesn't always need partitions on MO disks.
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The filesytem can go directly to the whole disk. Under other OSes
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this is known as the 'superfloppy' format.
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This switch will force
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.B mkdosfs
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to work properly.
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.TP
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.BI \-l " filename"
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Read the bad blocks list from
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.IR filename .
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.TP
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.BI \-m " message-file"
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Sets the message the user receives on attempts to boot this filesystem
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without having properly installed an operating system. The message
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file must not exceed 418 bytes once line feeds have been converted to
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carriage return-line feed combinations, and tabs have been expanded.
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If the filename is a hyphen (-), the text is taken from standard input.
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.TP
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.BI \-n " volume-name"
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Sets the volume name (label) of the filesystem. The volume name can
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be up to 11 characters long. The default is no label.
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.TP
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.BI \-r " root-dir-entries"
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Select the number of entries available in the root directory. The
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default is 112 or 224 for floppies and 512 for hard disks.
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.TP
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.BI \-R " number-of-reserved-sectors "
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Select the number of reserved sectos. With FAT32 format at least 2
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reserved sectors are needed, the default is 32. Otherwise the default
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is 1 (only the boot sector).
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.TP
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.BI \-s " sectors-per-cluster"
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Specify the number of disk sectors per cluster. Must be a power of 2,
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i.e. 1, 2, 4, 8, ... 128.
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.TP
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.BI \-S " logical-sector-size"
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Specify the number of bytes per logical sector. Must be a power of 2
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and greater than or equal to 512, i.e. 512, 1024, 2048, 4096, 8192,
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16384, or 32768.
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.TP
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.B \-v
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Verbose execution.
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.SH BUGS
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None are know at the moment. If you find any, please report it them
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to <hpa@yggdrasil.com>. Please include the version number (Yggdrasil 0.3a).
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.SH AUTHOR
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Dave Hudson - <dave@humbug.demon.co.uk>; modified by Peter Anvin
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<hpa@yggdrasil.com>. Fixes and additions by Roman Hodek
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<Roman.Hodek@informatik.uni-erlangen.de> for Debian/GNU Linux.
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.SH ACKNOWLEDGEMENTS
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.B mkdosfs
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is based on code from
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.BR mke2fs
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(written by Remy Card - <card@masi.ibp.fr>) which is itself based on
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.BR mkfs
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(written by Linus Torvalds - <torvalds@cs.helsinki.fi>).
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.SH SEE ALSO
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.BR dosfsck (8),
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.BR mkfs (8)
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