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.\"     @(#)newfs_hfs.8
.Dd April 1, 2003
.Dt NEWFS_HFS 8
.Os "Mac OS X"
.Sh NAME
.Nm mkfs.hfs
.Nd construct a new HFS Plus file system
.Sh SYNOPSIS
.Nm mkfs.hfs
.Op Fl N Ar [partition-size]
.Op Fl U Ar uid
.Op Fl G Ar gid
.Op Fl M Ar mask
.Op Fl h | w
.Op Fl s
.Op Fl b Ar block-size
.Op Fl c Ar clump-size-list
.Op Fl i Ar first-cnid
.Op Fl J Ar [journal-size]
.Op Fl n Ar node-size-list
.Op Fl v Ar volume-name
.Ar special
.Sh DESCRIPTION
.Nm mkfs.hfs
builds an HFS Plus file system on the specified special device.
.Pp
The file system default parameters are calculated based on
the size of the disk partition. Typically the defaults are
reasonable, however
.Nm mkfs.hfs
has several options to allow the defaults to be selectively overridden.
The options are as follows:
.Bl -tag -width Fl
.It Fl N Ar [partition-size]
Causes the file system parameters to be printed out
without really creating the file system.
.It Fl U Ar uid
Set the owner of the file system's root directory to
.Pa uid .
.It Fl G Ar gid
Set the group of the file system's root directory to
.Pa gid .
.It Fl M Ar mask
Specify the access permissions mask for the file system's root directory.
.It Fl h
Creates a legacy HFS format filesystem. This option
is not recommended for file systems that will be
primarily used with Mac OS X or Darwin.
.It Fl s
Creates a case-sensitive HFS Plus filesystem. By
default a case-insensitive filesystem is created.
Case-sensitive HFS Plus file systems require a Mac OS X
version of 10.3 (Darwin 7.0) or later. 
.It Fl w
Adds an HFS wrapper around the HFS Plus file system.
This wrapper is required if the file system will be used
to boot natively into Mac OS 9.
.It Fl b Ar block-size
The allocation block size of the file system.  
The default value is 4096.
.It Fl c Ar clump-size-list
This specifies the
.Em clump
and/or
.Em initial
sizes, in allocation
blocks, for the various metadata files.
.Em Clump
sizes are specified with the
.Fl c
option followed by a comma
separated list of the form arg=blocks.
.Pp
Example:  \-c c=5000,e=500
.Bl -tag -width Fl
.It Em a=blocks
Set the attribute file clump size.
.It Em b=blocks
Set the allocation bitmap file clump size.
.It Em c=blocks
Set the catalog file clump size.
.It Em e=blocks
Set the extent overflow file clump size.
.El
.It Fl i Ar first-cnid
This specifies the initial catalog node ID for user files
and directories. The default value is 16.
.It Fl J Ar [journal-size]
Creates a journaled HFS+ volume.
The default journal size is 8MB.  Appending an 'M' to the
journal size implies megabytes (i.e. 64M is 64 megabytes).
The maximum journal size is 512 megabytes.
.It Fl n Ar node-size-list
This specifies the b-tree
.Em node
sizes, in bytes,
for the various b-tree files.
.Em Node
sizes are specified with the
.Fl n
option followed by a comma separated list of
the form arg=bytes. The
.Em node
size must be a power of two and no larger than
32768 bytes.
.Pp
Example:  \-n c=8192,e=4096
.Bl -tag -width Fl
.It Em a=bytes
Set the attribute b-tree node size.
.It Em c=bytes
Set the catalog b-tree node size.
.It Em e=bytes
Set the extent overflow b-tree node size.
.El
.It Fl v Ar volume-name
Volume name (file system name) in ascii or UTF-8 format.
.El
.Sh SEE ALSO
.Xr mount 8
.Sh HISTORY
The
.Nm
command appeared in Mac OS X Server 1.0 .