.\" Copyright (C) 1998 Wolfgang Solfrank.
.\" Copyright (C) 1998 TooLs GmbH.
.\" All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
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.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by TooLs GmbH.
.\" 4. The name of TooLs GmbH may not be used to endorse or promote products
.\"    derived from this software without specific prior written permission.
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.\"	$NetBSD: mbrlabel.8,v 1.14 2003/07/13 09:56:09 lukem Exp $
.\"
.Dd July 13, 2003
.Dt MBRLABEL 8
.Os
.Sh NAME
.Nm mbrlabel
.Nd update disk label from MBR label(s)
.Sh SYNOPSIS
.Nm
.Op Fl fqrw
.Ar device
.Sh DESCRIPTION
.Nm
is used to update a
.Nx
disk label from the Master Boot Record (MBR) label(s) found
on disks that were previously used on DOS/Windows systems (or
other MBR using systems).
.Pp
.Nm
scans the MBR contained in the very first block of the disk,
then walks through every extended partition found and generating
additional partition entries for the disk from the MBRs found in
those extended partitions.
.Pp
Each MBR partition which does not have an equivalent partition in the
disk label (equivalent in having the same size and offset) is added to
the first free partition slot in the disk label.
A free partition slot is defined as one with an
.Dv fstype
of
.Sq Li unused
and a
.Dv size
of zero
.Pq Sq 0 .
If there are not enough free slots in the disk label, a warning
will be issued.
.Pp
The raw partition (typically partition
.Em c ,
but
.Em d
on i386 and some other platforms) is left alone during this process.
.Pp
By default, the proposed changed disk label will be displayed and no
disk label update will occur.
.Pp
Available options:
.Pp
.Bl -tag -width indent
.It Fl f
Force an update, even if there has been no change.
.It Fl q
Performs operations in a quiet fashion.
.It Fl w
Update the in-core label if it has been changed.
.It Fl r
In conjunction with
.Fl w ,
also update the on-disk label.
.El
.Sh SEE ALSO
.Xr disklabel 8 ,
.Xr dkctl 8 ,
.Xr fdisk 8 ,
.Xr mbr 8
.Sh HISTORY
The
.Nm
command appeared in
.Nx 1.4 .