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newfs_msdos (8)
  • >> newfs_msdos (8) ( FreeBSD man: Команды системного администрирования )

  • BSD mandoc
     

    NAME

    
    
    newfs_msdos
    
     - construct a new MS-DOS (FAT) file system
    
     
    

    SYNOPSIS

    [-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 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  

    SEE ALSO

    disktab(5), disklabel(8), fdisk(8), newfs(8)  

    HISTORY

    The utility first appeared in Fx 3.0 .  

    AUTHORS

    An Robert Nordier Aq [email protected] .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    NOTES
    EXIT STATUS
    EXAMPLES
    SEE ALSO
    HISTORY
    AUTHORS


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