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MBRLABEL(8)                 System Manager's Manual                MBRLABEL(8)

     mbrlabel -- update disk label from MBR label(s)

     mbrlabel [-fqrw] [-s sector] device

     mbrlabel is used to update a NetBSD 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).

     mbrlabel scans the MBR contained in the very first block of the disk (or
     the block specified through the -s flag), then walks through every
     extended partition found and generates additional partition entries for
     the disk from the MBRs found in those extended partitions.

     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 fstype of `unused' and a size of zero (`0').
     If there are not enough free slots in the disk label, a warning will be

     The raw partition (typically partition c, but d on i386 and some other
     platforms) is left alone during this process.

     By default, the proposed changed disk label will be displayed and no disk
     label update will occur.

     Available options:

     -f         Force an update, even if there has been no change.

     -q         Performs operations in a quiet fashion.

     -r         In conjunction with -w, also update the on-disk label.

     -s sector  Specifies the logical sector number that has to be read from
                the disk in order to find the MBR.  Useful if the disk has
                remapping drivers on it and the MBR is located in a non-
                standard place.  Defaults to 0.

     -w         Update the in-core label if it has been changed.  See also -r.

     disklabel(8), dkctl(8), fdisk(8), mbr(8)

     The mbrlabel command appeared in NetBSD 1.4.

NetBSD 6.1.5                     April 5, 2010                    NetBSD 6.1.5