'\" te
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.TH fmthard 1M "25 Sep 2008" "SunOS 5.11" "System Administration Commands"
.SH NAME
fmthard \- populate label on hard disks
.SH SYNOPSIS
.SS "SPARC"
.LP
.nf
\fBfmthard\fR \fB-d\fR \fIdata\fR | \fB-n\fR \fIvolume_name\fR | \fB-s\fR \fIdatafile\fR [\fB-i\fR] /dev/rdsk/c? 
     [t?] d?s2
.fi

.SS "x86"
.LP
.nf
\fBfmthard\fR \fB-d\fR \fIdata\fR | \fB-n\fR \fIvolume_name\fR | \fB-s\fR \fIdatafile\fR [\fB-i\fR] /dev/rdsk/c? 
     [t?] d?s2
.fi

.SH DESCRIPTION
.sp
.LP
The \fBfmthard\fR command updates the \fBVTOC\fR (Volume Table of Contents) on
hard disks and, on x86 systems, adds boot information to the Solaris
\fBfdisk\fR partition. One or more of the options \fB-s\fR \fIdatafile\fR,
\fB-d\fR \fIdata\fR, or \fB-n\fR \fIvolume_name\fR must be used to request
modifications to the disk label. To print disk label contents, see
\fBprtvtoc\fR(1M). The
\fB/dev/rdsk/c\fR\fI?\fR[\fBt\fR\fI?\fR]\fBd\fR\fI?\fR\fBs2\fR file must be the
character special file of the device where the new label is to be installed. On
x86 systems, \fBfdisk\fR(1M) must be run on the drive before \fBfmthard\fR.
.sp
.LP
If you are using an x86 system, note that the term ``partition'' in this page
refers to \fIslices\fR within the x86 \fBfdisk\fR partition on x86 machines. Do
not confuse the partitions created by \fBfmthard\fR with the partitions created
by \fBfdisk\fR.
.SH OPTIONS
.sp
.LP
The following options are supported:
.sp
.ne 2
.mk
.na
\fB\fB-d\fR \fIdata\fR\fR
.ad
.sp .6
.RS 4n
The \fIdata\fR argument of this option is a string representing the information
for a particular partition in the current VTOC. The string must be of the
format \fIpart:tag:flag:start:size\fR where \fIpart\fR is the partition number,
\fItag\fR is the \fBID\fR TAG of the partition, \fIflag\fR is the set of
permission flags, \fIstart\fR is the starting sector number of the partition,
and \fIsize\fR is the number of sectors in the partition. See the description
of the \fIdatafile\fR below for more information on these fields.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-i\fR\fR
.ad
.sp .6
.RS 4n
This option allows the command to create the desired \fBVTOC\fR table, but
prints the information to standard output instead of modifying the \fBVTOC\fR
on the disk.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-n\fR \fIvolume_name\fR\fR
.ad
.sp .6
.RS 4n
This option is used to give the disk a \fIvolume_name\fR up to 8 characters
long.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-s\fR \fIdatafile\fR\fR
.ad
.sp .6
.RS 4n
This option is used to populate the \fBVTOC\fR according to a \fIdatafile\fR
created by the user. If the \fIdatafile\fR is \fB\(mi\fR (a hyphen),
\fBfmthard\fR reads from standard input. The \fIdatafile\fR format is described
below. This option causes all of the disk partition timestamp fields to be set
to zero.
.sp
Every \fBVTOC\fR generated by \fBfmthard\fR will also have partition 2, by
convention, that corresponds to the whole disk. If the input in \fIdatafile\fR
does not specify an entry for partition 2, a default partition 2 entry will be
created automatically in \fBVTOC\fR with the tag \fBV_BACKUP\fR and size equal
to the full size of the disk.
.sp
The \fIdatafile\fR contains one specification line for each partition, starting
with partition 0. Each line is delimited by a new-line character (\fB\en\fR).
If the first character of a line is an asterisk (*), the line is treated as a
comment. Each line is composed of entries that are position-dependent,
separated by white space and having the following format:
.sp
\fIpartition tag flag starting_sector size_in_sectors\fR
.sp
where the entries have the following values:
.sp
.ne 2
.mk
.na
\fB\fIpartition\fR\fR
.ad
.sp .6
.RS 4n
The partition number. Currently, for Solaris SPARC, a disk can have up to 8
partitions, \fB0\fR\(mi\fB7\fR. Even though the \fIpartition\fR field has 4
bits, only 3 bits are currently used. For x86, all 4 bits are used to allow
slices \fB0\fR\(mi\fB15\fR. Each Solaris \fBfdisk\fR partition can have up to
16 slices.
.RE

.sp
.ne 2
.mk
.na
\fB\fItag\fR\fR
.ad
.sp .6
.RS 4n
The partition tag: a decimal number. The following are reserved codes: \fB0\fR
(\fBV_UNASSIGNED\fR), \fB1\fR (\fBV_BOOT\fR), \fB2\fR (\fBV_ROOT\fR), \fB3\fR
(\fBV_SWAP\fR), \fB4\fR (\fBV_USR\fR), \fB5\fR (\fBV_BACKUP\fR), \fB6\fR
(\fBV_STAND\fR), \fB7\fR (\fBV_VAR\fR), and \fB8\fR (\fBV_HOME\fR).
.RE

.sp
.ne 2
.mk
.na
\fB\fIflag\fR\fR
.ad
.sp .6
.RS 4n
The flag allows a partition to be flagged as unmountable or read only, the
masks being: \fBV_UNMNT 0x01\fR, and \fBV_RONLY 0x10\fR. For mountable
partitions use \fB0x00\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fIstarting_sector\fR\fR
.ad
.sp .6
.RS 4n
The sector number (decimal) on which the partition starts.
.RE

.sp
.ne 2
.mk
.na
\fB\fIsize_in_sectors\fR\fR
.ad
.sp .6
.RS 4n
The number (decimal) of sectors occupied by the partition.
.RE

You can save the output of a \fBprtvtoc\fR command to a file, edit the file,
and use it as the \fIdatafile\fR argument to the \fB-s\fR option.
.RE

.SH SEE ALSO
.sp
.LP
\fBuname\fR(1), \fBformat\fR(1M), \fBprtvtoc\fR(1M), \fBattributes\fR(5)
.SS "x86 Only"
.sp
.LP
\fBfdisk\fR(1M), \fBinstallgrub\fR(1M)
.SH NOTES
.sp
.LP
Special care should be exercised when overwriting an existing \fBVTOC\fR, as
incorrect entries could result in current data being inaccessible. As a
precaution, save the old \fBVTOC\fR.
.sp
.LP
For disks under two terabytes, \fBfmthard\fR cannot write a \fBVTOC\fR on an
unlabeled disk. Use \fBformat\fR(1M) for this purpose.