mbrlabel(8) - NetBSD Manual Pages

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


NAME

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


SYNOPSIS

     mbrlabel [-fqrw] [-s sector] device


DESCRIPTION

     mbrlabel is used to update a NetBSD disk label from the Master Boot
     Record (MBR) label and Extended Boot Record (EBR) label(s) found on disks
     that were previously used on DOS/Windows systems (or other MBR using sys-
     tems).

     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 EBRs found in those extended partitions.

     Each MBR and each EBR partition which does not have an equivalent parti-
     tion 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 parti-
     tion 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 issued.

     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.

     The following options are available:

     -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-stan-
                dard place.  Defaults to 0.

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


SEE ALSO

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

     Microsoft corporation, Disk Concepts and Troubleshooting, Microsoft
     technical library.


HISTORY

     The mbrlabel command appeared in NetBSD 1.4.

NetBSD 10.1                    February 27, 2013                   NetBSD 10.1