newfs_exfat(8) [mojave man page]
NEWFS_EXFAT(8) BSD System Manager's Manual NEWFS_EXFAT(8) NAME
newfs_exfat -- construct a new ExFAT file system SYNOPSIS
newfs_exfat [-N] [-R] [-I volume-serial-number] [-S bytes-per-sector] [-a sectors-per-FAT] [-b bytes-per-cluster] [-c sectors-per-cluster] [-n number-of-FATs] [-s total-sectors] [-v volume-name] special DESCRIPTION
The newfs_exfat utility creates an ExFAT file system on device special. If the -R option is not given, and the device is already formatted as ExFAT, it will preserve the partition offset, bytes per cluster, FAT offset and size, number of FATs, offset to start of clusters, number of clusters, volume serial number, and volume name (label). If a volume name was specified via the -v option, that name is used instead of the volume's previous name. The options are as follow: -N Don't create a file system: just print out parameters. -R Do not check whether the device is currently formatted as ExFAT. Always derive the partition offset, bytes per cluster, FAT offset and size, and offset to start of clusters based on the device type and size. -I volume-serial-number Volume ID, a 32-bit integer. -S bytes-per-sector Number of bytes per sector. Acceptable values are powers of 2 in the range 512 through 4096. -a sectors-per-FAT Number of sectors per FAT. -b bytes-per-cluster File system block size (bytes per cluster). Acceptable values are powers of 2 in the range 512 through 33554432. -c sectors-per-cluster Sectors per cluster. Acceptable values are powers of 2 in the range 1 through 65536. -n number-of-FATs Number of FATs. Acceptable values are 1 or 2. The default is 1. Using any value other than 1 is discouraged, and may be incompati- ble with other devices. -s total-sectors The total number of sectors in the device. -v volume-name Volume name (label). The name will be converted to UTF-16, and must be no longer than 11 UTF-16 characters. ASCII control charac- ters and some punctuation characters are not allowed (similar to DOS 8.3-style names). NOTE: The volume name may be an empty (zero- length) string. EXAMPLES
newfs_exfat /dev/disk0s1 Create a file system, using default parameters (or existing ExFAT layout), on /dev/rdisk0s1. newfs_exfat -v Hello disk2s1 Create a file system with the name "Hello" on /dev/rdisk2s1. SEE ALSO
mount_exfat(8), fsck_exfat(8) DIAGNOSTICS
Exit status is 0 on success and 1 on error. HISTORY
The newfs_exfat command appeared in Mac OS X 10.6.3. Darwin January 19, 2010 Darwin
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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 geome- try, 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 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, 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