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] [-B boot] [-F FAT-type] [-I volid] [-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] [-v volume-name]
special [disktype]
DESCRIPTION
The newfs_msdos utility creates a FAT12, FAT16, or FAT32 file system on
device special, using disktab(5) entry disktype to determine geometry, if
required.
The options are as follows:
-N Don't create a file system: just print out parameters.
-B boot
Get bootstrap from file.
-F FAT-type
FAT type (one of 12, 16, or 32).
-I volid
Volume ID.
-O OEM OEM string (up to 8 characters). The default is "BSD 4.4" (with
two spaces).
-S sector-size
Number of bytes per sector. Acceptable values are powers of 2 in
the range 128 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.
-e dirents
Number of root directory entries (FAT12 and FAT16 only).
-f format
Specify a standard (floppy disk) format. The eight standard for-
mats 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, in sectors.
-u track-size
Number of sectors per track.
-v volume-name
Volume name (filesystem name), up to 11 characters. The name
should consist of only those characters permitted in regular DOS
(8+3) filenames.
NOTES
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/disk0s1
Create a file system, using default parameters, on /dev/disk0s1.
newfs_msdos -f 1440 -v foo fd0
Create a standard 1.44M file system, with volume name "foo", on /dev/fd0.
SEE ALSO
fdisk(8), mount(8)
DIAGNOSTICS
Exit status is 0 on success and 1 on error.
HISTORY
The newfs_msdos command appeared in FreeBSD 3.0.
AUTHORS
Robert Nordier <rnordier@FreeBSD.org>.
BSD July 6, 1998 BSD
Mac OS X 10.8 - Generated Mon Sep 3 15:22:50 CDT 2012