NAME
newfs_msdos
- construct a new MS-DOS (FAT) file system
SYNOPSIS
newfs_msdos
[-N]
[-B boot]
[-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
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.
- -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.
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.
- -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
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
.
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
NetBSD1.3.
AUTHORS
Robert Nordier <rnordier@FreeBSD.org>
.