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NetBSD 6.1.5 - man page for newfs_msdos (netbsd section 8)

NEWFS_MSDOS(8)			   BSD System Manager's Manual			   NEWFS_MSDOS(8)

NAME
     newfs_msdos -- construct a new MS-DOS (FAT) file system

SYNOPSIS
     newfs_msdos [-N] [-@ offset] [-B boot] [-C create-size] [-F FAT-type] [-I volid] [-L label]
		 [-O OEM] [-S sector-size] [-a FAT-size] [-b block-size] [-c cluster-size]
		 [-e dirents] [-f format] [-h heads] [-i info] [-k backup] [-m media] [-n FATs]
		 [-o hidden] [-r reserved] [-s total] [-u track-size] special [disktype]

DESCRIPTION
     The newfs_msdos utility creates a FAT12, FAT16, or FAT32 file system on device or file named
     special, using disktab(5) entry disktype to determine geometry, if required.

     The options are as follow:

     -N      Don't create a file system: just print out parameters.

     -@ offset
	     Build the filesystem at the specified offset in bytes in the device or file.  A suf-
	     fix s, k, m, g (lower or upper case) appended to the offset specifies that the num-
	     ber is in sectors, kilobytes, megabytes or gigabytes, respectively.

     -B boot
	     Get bootstrap from file.

     -C create-size
	     Create the image file with the specified size.  A suffix character appended to the
	     size is interpreted as for the -@ option.	The file is created by truncating any
	     existing file with the same name, seeking just before the required size and writing
	     a single 0 byte.  As a consequence, the space occupied on disk may be smaller than
	     the size specified as a parameter.

     -F FAT-type
	     FAT type (one of 12, 16, or 32).

     -I volid
	     Volume ID.

     -L label
	     Volume label (up to 11 characters).  The label should consist of only those charac-
	     ters permitted in regular DOS (8+3) filenames.  The default is "NO_NAME".

     -O OEM  OEM string (up to 8 characters).  The default is "NetBSD".

     -S sector-size
	     Number of bytes per sector.  Acceptable values are powers of 2 in the range 512
	     through 32768.

     -a FAT-size
	     Number of sectors per FAT.

     -b block-size
	     File system block size (bytes per cluster).  This should resolve to an acceptable
	     number of sectors per cluster (see below).

     -c cluster-size
	     Sectors per cluster.  Acceptable values are powers of 2 in the range 1 through 128.
	     If the block or cluster size are not specified, the code uses a cluster between 512
	     bytes and 32K depending on the filesystem size.

     -e dirents
	     Number of root directory entries (FAT12 and FAT16 only).

     -f format
	     Specify a standard (floppy disk) format.  The standard formats are (capacities in
	     kilobytes): 160, 180, 320, 360, 640, 720, 1200, 1232, 1440, 2880.

     -h heads
	     Number of drive heads.

     -i info
	     Location of the file system info sector (FAT32 only).  A value of 0xffff signifies
	     no info sector.

     -k backup
	     Location of the backup boot sector (FAT32 only).  A value of 0xffff signifies no
	     backup sector.

     -m media
	     Media descriptor (acceptable range 0xf0 to 0xff).

     -n FATs
	     Number of FATs.  Acceptable values are 1 to 16 inclusive.	The default is 2.

     -o hidden
	     Number of hidden sectors.

     -r reserved
	     Number of reserved sectors.

     -s total
	     File system size.

     -u track-size
	     Number of sectors per track.

     If newfs_msdos receives a SIGINFO signal (see the status argument for stty(1)), a line will
     be written to the standard error output indicating the name of the device currently being
     formatted, the sector number being written, and the total number of sectors to be written.

NOTES
     If some parameters (e.g. size, number of sectors, etc.) are not specified through options or
     disktype, the program tries to generate them automatically.  In particular, the size is
     determined as the device or file size minus the offset specified with the -@ option.  When
     the geometry is not available, it is assumed to be 63 sectors, 255 heads.	The size is then
     rounded to become a multiple of the track size and avoid complaints by some filesystem code.

     FAT file system parameters occupy a "Boot Sector BPB (BIOS Parameter Block)" in the first of
     the "reserved" sectors which precede the actual file system.  For reference purposes, this
     structure is presented below.

     struct bsbpb {
	 u_int16_t   bps;	     /* [-S] bytes per sector */
	 u_int8_t    spc;	     /* [-c] sectors per cluster */
	 u_int16_t   res;	     /* [-r] reserved sectors */
	 u_int8_t    nft;	     /* [-n] number of FATs */
	 u_int16_t   rde;	     /* [-e] root directory entries */
	 u_int16_t   sec;	     /* [-s] total sectors */
	 u_int8_t    mid;	     /* [-m] media descriptor */
	 u_int16_t   spf;	     /* [-a] sectors per FAT */
	 u_int16_t   spt;	     /* [-u] sectors per track */
	 u_int16_t   hds;	     /* [-h] drive heads */
	 u_int32_t   hid;	     /* [-o] hidden sectors */
	 u_int32_t   bsec;	     /* [-s] big total sectors */
     };
     /* FAT32 extensions */
     struct bsxbpb {
	 u_int32_t   bspf;	     /* [-a] big sectors per FAT */
	 u_int16_t   xflg;	     /* control flags */
	 u_int16_t   vers;	     /* file system version */
	 u_int32_t   rdcl;	     /* root directory start cluster */
	 u_int16_t   infs;	     /* [-i] file system info sector */
	 u_int16_t   bkbs;	     /* [-k] backup boot sector */
     };

EXAMPLES
	   newfs_msdos /dev/rwd1a

     Create a file system, using default parameters, on /dev/rwd1a.

	   newfs_msdos -f 1440 -L foo /dev/rfd0a

     Create a standard 1.44M file system, with volume label foo, on /dev/rfd0a.  Create a 30MB
     image file, with the FAT partition starting 63 sectors within the image file:

	   newfs_msdos -C 30M -@63s ./somefile

DIAGNOSTICS
     Exit status is 0 on success and 1 on error.

SEE ALSO
     disktab(5), disklabel(8), fdisk(8), newfs(8)

HISTORY
     The newfs_msdos command first appeared in NetBSD 1.3.

AUTHORS
     Robert Nordier <rnordier@FreeBSD.org>.

BSD					  March 26, 2009				      BSD


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