NEWFS_MSDOS(8) | System Manager's Manual | NEWFS_MSDOS(8) |
newfs_msdos
—
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] [-T
timestamp] [-u
track-size] special
[disktype] |
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
-@
offset-B
boot-C
create-size-@
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-I
volid-L
labelNO NAME
”.-O
OEMNetBSD
”.-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-T
AT&T UNIX timestamp-u
track-sizeIf 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.
-@
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
file system 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 */ };
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
newfs_msdos
utility appeared in
FreeBSD 3.0. The newfs_msdos
command first appeared in NetBSD 1.3.
February 16, 2017 | NetBSD 9.4 |