NEWFS(8) System Manager's Manual NEWFS(8)
newfs - construct a new file system
/etc/newfs [ -v ] [ -n ] [ mkfs-options ] special disk-type
Newfs is a ``friendly'' front-end to the mkfs(8) program. Newfs will
look up the type of disk a file system is being created on in the disk
description file /etc/disktab, calculate the appropriate parameters to
use in calling mkfs, then build the file system by forking mkfs and, if
the file system is a root partition, install the necessary bootstrap
programs in the initial 8 sectors of the device. The -n option pre-
vents the bootstrap programs from being installed.
If the -v option is supplied, newfs will print out its actions, includ-
ing the parameters passed to mkfs.
Options which may be used to override default parameters passed to mkfs
-s size The size of the file system in sectors.
The block size of the file system in bytes.
The fragment size of the file system in bytes.
The number of cylinders per cylinder group in a file system.
The default value used is 16.
-m free space %
The percentage of space reserved from normal users; the mini-
mum free space threshhold. The default value used is 10%.
The speed of the disk in revolutions per minute (normally
The size of a sector in bytes (almost never anything but
-i number of bytes per inode
This specifies the density of inodes in the file system. The
default is to create an inode for each 2048 bytes of data
space. If fewer inodes are desired, a larger number should
be used; to create more inodes a smaller number should be
/etc/disktab for disk geometry and file system partition information
/etc/mkfs to actually build the file system
/usr/mdec for boot strapping programs
disktab(5), fs(5), diskpart(8), fsck(8), format(8), mkfs(8), tunefs(8)
McKusick, Joy, Leffler; "A Fast File System for Unix", Computer Systems
Research Group, Dept of EECS, Berkeley, CA 94720; TR #7, September
Should figure out the type of the disk without the user's help.
4th Berkeley Distribution 20 February 1983 NEWFS(8)