The
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 follow:
-N
Do not 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.
-L label
Volume label (up to 11 characters).
The label should consist of
only those characters permitted in regular DOS (8+3) filenames.
-O OEM
OEM string (up to 8 characters).
The default is
Qq Li BSD 4.4 .
-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 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.
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 */
};
EXIT STATUS
Exit status is 0 on success and 1 on error.
EXAMPLES
newfs_msdos /dev/ad0s1
Create a file system, using default parameters, on
/dev/ad0s1
newfs_msdos -f 1440 -L foo fd0
Create a standard 1.44M file system, with volume label
foo
on
/dev/fd0
