1998-11-16 21:44:25 +03:00
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.\" Copyright (C) 1998 Wolfgang Solfrank.
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.\" Copyright (C) 1998 TooLs GmbH.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by TooLs GmbH.
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.\" 4. The name of TooLs GmbH may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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.\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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.\" OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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.\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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.\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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1999-03-22 21:43:46 +03:00
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.\" $NetBSD: mbrlabel.8,v 1.3 1999/03/22 18:44:01 garbled Exp $
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1998-11-16 21:44:25 +03:00
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.\"
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.Dd November 15, 1998
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.Dt MBRLABEL 8
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1999-03-22 21:43:46 +03:00
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.Os
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1998-11-16 21:44:25 +03:00
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.Sh NAME
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.Nm mbrlabel
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1998-11-17 16:04:30 +03:00
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.Nd generate incore disklabel from MBR label(s)
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1998-11-16 21:44:25 +03:00
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.Sh SYNOPSIS
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.Nm
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.Ar device
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.Sh DESCRIPTION
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.Nm
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is used to generate an incore disklabel from the MBR label(s) found
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on disks that were previously used on DOS/Windows systems (or
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other MBR using systems).
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.Pp
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The
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.Nm
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utility generates an incore label from the MBR contained in the very first
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block of the disk, then walking through every extended partition found
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and generating additional partition entries for the disk from the
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MBRs found in those extended partitions.
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The partitions are sequentially entered into the constructed disklabel
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as partitions
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.Em a , b
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and so on until no more MBR partitions are found or all available
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entries in the disklabel are used up.
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The raw partition (typically partition
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.Em c ,
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but
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.Em d
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on i386) is left alone during this process.
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The resulting disklabel is then placed as the incore disklabel for
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this disk.
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.Sh BUGS
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Due to the way disk drivers currently work in
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.Nx ,
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any incore disklabel is forgotten whenever the last partition of a
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disk is closed.
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Since typically you wouldn't have a partition open on a disk while
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running
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.Nm
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this lossage will most likely happen, if
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.Nm
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is used naively.
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.Pp
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The workaround until the disk drivers are fixed is to keep the
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raw partition open until you access the partition(s) of the
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disk via e.g.
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.Xr mount 8 .
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.Pp
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E.g. you could use
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.Dl sleep 100</dev/rsd0c &
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.Dl mbrlabel sd0
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.Dl mount -t msdos /dev/sd0a /msdos
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to mount a disk containing only one DOS partition.
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.Sh SEE ALSO
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.Xr disklabel 8
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Nx 1.4 .
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