1.\" Copyright (C) 1998 Wolfgang Solfrank. 2.\" Copyright (C) 1998 TooLs GmbH. 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 3. All advertising materials mentioning features or use of this software 14.\" must display the following acknowledgement: 15.\" This product includes software developed by TooLs GmbH. 16.\" 4. The name of TooLs GmbH may not be used to endorse or promote products 17.\" derived from this software without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 20.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22.\" IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 24.\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 25.\" OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 26.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 27.\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 28.\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29.\" 30.\" $NetBSD: mbrlabel.8,v 1.20 2013/02/27 21:21:47 wiz Exp $ 31.\" 32.Dd February 27, 2013 33.Dt MBRLABEL 8 34.Os 35.Sh NAME 36.Nm mbrlabel 37.Nd update disk label from MBR label(s) 38.Sh SYNOPSIS 39.Nm 40.Op Fl fqrw 41.Op Fl s Ar sector 42.Ar device 43.Sh DESCRIPTION 44.Nm 45is used to update a 46.Nx 47disk label from the Master Boot Record (MBR) label and Extended 48Boot Record (EBR) label(s) found 49on disks that were previously used on DOS/Windows systems (or 50other MBR using systems). 51.Pp 52.Nm 53scans the MBR contained in the very first block of the disk (or the 54block specified through the 55.Fl s 56flag), then walks through every extended partition found and generates 57additional partition entries for the disk from the EBRs found in 58those extended partitions. 59.Pp 60Each MBR and each EBR partition which does not have an equivalent partition 61in the disk label (equivalent in having the same size and offset) is added to 62the first free partition slot in the disk label. 63A free partition slot is defined as one with an 64.Dv fstype 65of 66.Sq Li unused 67and a 68.Dv size 69of zero 70.Pq Sq 0 . 71If there are not enough free slots in the disk label, a warning 72will be issued. 73.Pp 74The raw partition (typically partition 75.Em c , 76but 77.Em d 78on i386 and some other platforms) is left alone during this process. 79.Pp 80By default, the proposed changed disk label will be displayed and no 81disk label update will occur. 82.Pp 83The following options are available: 84.Bl -tag -width sXsectorX 85.It Fl f 86Force an update, even if there has been no change. 87.It Fl q 88Performs operations in a quiet fashion. 89.It Fl r 90In conjunction with 91.Fl w , 92also update the on-disk label. 93.It Fl s Ar sector 94Specifies the logical sector number that has to be read from the disk 95in order to find the MBR. 96Useful if the disk has remapping drivers on it and the MBR is located 97in a non-standard place. 98Defaults to 0. 99.It Fl w 100Update the in-core label if it has been changed. 101See also 102.Fl r . 103.El 104.Sh SEE ALSO 105.Xr disklabel 8 , 106.Xr dkctl 8 , 107.Xr fdisk 8 , 108.Xr mbr 8 109.Rs 110.%A Tn Microsoft corporation 111.%T "Disk Concepts and Troubleshooting" 112.%R Tn Microsoft technical library 113.Re 114.Sh HISTORY 115The 116.Nm 117command appeared in 118.Nx 1.4 . 119