# 2.11BSD#431 - /usr/man/cat8/mkfs.0

    MKFS(8)             UNIX Programmer's Manual		  MKFS(8)

    NAME
         mkfs - construct a file system

    SYNOPSIS
         /sbin/mkfs [ -i bytes ] [ -s size ] [ -m gap ] [ -n modulus
         ] special

    DESCRIPTION
         N.B.: file systems are normally created with the newfs(8)
         command.

         Mkfs constructs a file system by writing on the special file
         special.  The size of the filesystem in logical blocks is
         specified by the -s size option.  Logical blocks are 1K (2
         sectors) under 2.11BSD.

    	  NOTE: The newfs(8) program's -s option is in units of
    	  sectors. Newfs(8) converts this to filesystem (logical)
    	  blocks for mkfs(8).

         The number of inodes is calculated based on the argument
         bytes to the -i option.  The default is 4096.  If more
         inodes are desired in a filesystem (there is an absolute
         maximum of 65500) then a lower value for bytes should be
         used, perhaps 3072 or even 2048.

         The flags -m gap and -n modulus determine the block inter-
         leaving of the freelist that will be constructed, where gap
         is the distance between successive 1024-byte blocks, and
         modulus is the number of blocks before the pattern repeats,
         typically one cylinder.  The optimal values for these param-
         eters vary with the speed and geometry of the disk, as well
         as the speed of the processor. Newfs(8) will calculate the
         correct values in almost all cases from the disklabel.

    SEE ALSO
         fs(5), dir(5), disklabel(8), fsck(8), mkproto(8) newfs(8)

    BUGS
         The lost+found directory is created but the boot block is
         left uninitialized (see disklabel(8).)

    Printed 11/24/99	November 16, 1996			1

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