NEWFS_HFS
Section: Maintenance Commands (8)
Page Index
BSD mandoc
Mac OS X
NAME
mkfs.hfsplus
- construct a new HFS Plus file system
SYNOPSIS
mkfs.hfsplus
[-
N
]
[-
U uid
]
[-
G gid
]
[-
M mask
]
[-
P
]
[-
s
]
[-
b block-size
]
[-
c clump-size-list
]
[-
i first-cnid
]
[-
J [journal-size]
]
[-
n node-size-list
]
[-
v volume-name
]
special
mkfs.hfsplus
-
N partition-size
[-
U uid
]
[-
G gid
]
[-
M mask
]
[-
P
]
[-
h | w
]
[-
s
]
[-
b block-size
]
[-
c clump-size-list
]
[-
i first-cnid
]
[-
J [journal-size]
]
[-
n node-size-list
]
[-
v volume-name
]
DESCRIPTION
mkfs.hfsplus
builds an HFS Plus file system on the specified special device.
Before running
mkfs.hfsplus
the disk should be partitioned using the
Disk Utility
application or
pdisk(8).
The file system default parameters are calculated based on
the size of the disk partition. Typically the defaults are
reasonable, however
mkfs.hfsplus
has several options to allow the defaults to be selectively overridden.
The options are as follows:
- -N [partition-size]
-
Causes the file system parameters to be printed out
without really creating the file system.
If the argument following the
-N
starts with a decimal digit, it is assumed to be a partition size.
The paritition size may be given in decimal, octal (with leading `0'),
or hexadecimal (with leading `0x').
The partition size argument can be specified in 512-byte blocks (with a `b' suffix),
petabytes (`p' suffix), terabytes (`t' suffix), gigabytes
(`g' suffix), megabytes (`m' suffix), or kilobytes
(`k' suffix). All suffixes indicate binary, not decimal,
multipliers (e.g., `1k' is 1024 bytes). If no suffix is
specified, the value is assumed to be in bytes; if an illegal
suffix is specified, it results in a size of 0 bytes.
If the partition size is given, then no special device argument shall be provided.
If no partition size is given, then the size of the given special device
is used instead, and the special device will not be written to.
- -U uid
-
Set the owner of the file system's root directory to
uid
- -G gid
-
Set the group of the file system's root directory to
gid
- -M mask
-
Specify the octal access permissions mask for the file system's root
directory.
- -P
-
Set kHFSContentProtectionBit in the volume's attributes, which will cause the
volume to be mounted with the "protect" option if the kernel supports it.
- -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.
- -b block-size
-
The allocation block size of the file system.
The default value is 4096.
- -c clump-size-list
-
This specifies the
clump
and/or
initial
sizes, in allocation
blocks, for the various metadata files.
Clump
sizes are specified with the
-c
option followed by a comma
separated list of the form arg=blocks.
Example: -c c=5000,e=500
- a=blocks
-
Set the attribute file clump size.
- b=blocks
-
Set the allocation bitmap file clump size.
- c=blocks
-
Set the catalog file clump size.
- d=blocks
-
Set the data fork clump size.
- e=blocks
-
Set the extent overflow file clump size.
- r=blocks
-
Set the resource fork clump size.
- -i first-cnid
-
This specifies the initial catalog node ID for user files
and directories. The default value is 16.
- -J [journal-size]
-
Creates a journaled HFS+ volume.
The default journal size varies, based on the size of the volume. Appending an 'M' to the
journal size implies megabytes (i.e. 64M is 64 megabytes).
The maximum journal size is 1024 megabytes.
- -n node-size-list
-
This specifies the b-tree
node
sizes, in bytes,
for the various b-tree files.
Node
sizes are specified with the
-n
option followed by a comma separated list of
the form arg=bytes. The
node
size must be a power of two and no larger than
32768 bytes.
Example: -n c=8192,e=4096
- a=bytes
-
Set the attribute b-tree node size.
- c=bytes
-
Set the catalog b-tree node size.
- e=bytes
-
Set the extent overflow b-tree node size.
- -v volume-name
-
Volume name (file system name) in ascii or UTF-8 format.
SEE ALSO
mount(8),
pdisk(8)
HISTORY
The
mkfs.hfsplus
command appeared in Mac OS X Server 1.0 . As of Mac OS X 10.6, this utility no longer generates HFS standard file systems.