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DESCRIPTION

The options are as follow:

-N

Do not create a file system: just print out parameters.

-@ offset

Build the file system at the specified offset in bytes in the device or file. A suffix s, k, m, g (lower or upper case) appended to the offset specifies that the number is in sectors, kilobytes, megabytes or gigabytes, respectively.

-B boot

Get bootstrap from file.

-C create-size

Create the image file with the specified size. A suffix character appended to the size is interpreted as for the -@ 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

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. If the block or cluster size are not specified, the code uses a cluster between 512 bytes and 32K depending on the file system size.

-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.

-T AT&T UNIX timestamp

Specify a timestamp to be used for file system creation so that it can be consistent for reproducible builds. The timestamp can be a pathname, where the timestamps are derived from that file, a parseable date for parsedate(3) (this option is not yet available in the tools build), or an integer value interpreted as the number of seconds from the Epoch.

-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.

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

newfs_msdos -f 1440 -L foo /dev/rfd0a

newfs_msdos -C 30M -@63s ./somefile