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.\" Copyright (C) 1998 Wolfgang Solfrank.
.\" Copyright (C) 1998 TooLs GmbH.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
.\" IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
.\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
.\" OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
.\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
.\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\" $NetBSD: mbrlabel.8,v 1.4 2000/03/15 11:55:34 fvdl Exp $
.\"
.Dd November 15, 1998
.Dt MBRLABEL 8
.Os
.Sh NAME
.Nm mbrlabel
.Nd generate incore disklabel from MBR label(s)
.Sh SYNOPSIS
.Nm
.Ar device
.Sh DESCRIPTION
.Nm
is used to generate an incore disklabel from the MBR label(s) found
on disks that were previously used on DOS/Windows systems (or
other MBR using systems).
.Pp
The
.Nm
utility generates an incore label from the MBR contained in the very first
block of the disk, then walking through every extended partition found
and generating additional partition entries for the disk from the
MBRs found in those extended partitions.
The partitions are sequentially entered into the constructed disklabel
as partitions
.Em a , b
and so on until no more MBR partitions are found or all available
entries in the disklabel are used up.
The raw partition (typically partition
.Em c ,
but
.Em d
on i386) is left alone during this process.
The resulting disklabel is then placed as the incore disklabel for
this disk.
.Sh BUGS
Due to the way disk drivers currently work in
.Nx ,
any incore disklabel is forgotten whenever the last partition of a
disk is closed.
Since typically you wouldn't have a partition open on a disk while
running
.Nm
this lossage will most likely happen, if
.Nm
is used naively.
.Pp
The workaround until the disk drivers are fixed is to keep the
raw partition open until you access the partition(s) of the
disk via e.g.
.Xr mount 8 .
.Pp
E.g. you could use
.Dl sleep 100</dev/rsd0c &
.Dl mbrlabel sd0
.Dl mount -t msdos /dev/sd0a /msdos
to mount a disk containing only one DOS partition.
.Sh SEE ALSO
.Xr disklabel 8
.Sh HISTORY
The
.Nm
command appeared in
.Nx 1.4 .