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Annotation of src/sbin/fdisk/fdisk.8, Revision 1.66

1.66    ! tsutsui     1: .\"    $NetBSD: fdisk.8,v 1.65 2009/11/28 17:25:45 tsutsui Exp $
1.8       cgd         2: .\"
1.64      tsutsui     3: .Dd November 28, 2009
1.1       cgd         4: .Dt FDISK 8
1.25      wiz         5: .Os
1.1       cgd         6: .Sh NAME
                      7: .Nm fdisk
1.43      lukem       8: .Nd MS-DOS partition maintenance program
1.1       cgd         9: .Sh SYNOPSIS
1.34      wiz        10: .Nm
1.44      dyoung     11: .Op Fl afiuvBFS
1.17      mycroft    12: .Bk -words
1.9       phil       13: .Op Fl 0 | 1 | 2 | 3
1.17      mycroft    14: .Ek
                     15: .Bk -words
1.44      dyoung     16: .Op Fl t Ar disktab
                     17: .Ek
                     18: .Bk -words
                     19: .Op Fl T Ar disktype
                     20: .Ek
                     21: .Bk -words
1.35      dsl        22: .Op Fl E Ar number
                     23: .Ek
                     24: .Bk -words
1.10      phil       25: .Op Fl b Ar cylinders/heads/sectors
1.17      mycroft    26: .Ek
                     27: .Bk -words
1.38      wiz        28: .Op Fl s Ar id/start/size Ns Bq Ar /bootmenu
1.17      mycroft    29: .Ek
                     30: .Bk -words
1.16      ws         31: .Op Fl c Ar bootcode
1.17      mycroft    32: .Ek
                     33: .Bk -words
1.35      dsl        34: .Op Fl r|w Ar file
                     35: .Ek
                     36: .Bk -words
1.6       mycroft    37: .Op Ar device
1.17      mycroft    38: .Ek
1.35      dsl        39: .Nm
                     40: .Fl l
1.24      lukem      41: .Sh DESCRIPTION
1.35      dsl        42: The
1.1       cgd        43: .Nm
1.54      apb        44: program is used to display or update the
                     45: .Em "master boot record"
                     46: or
                     47: .Em MBR
                     48: in the first sector (sector 0)
                     49: of a disk that uses the MBR style of partitioning.
                     50: The following
                     51: .Nx
                     52: ports use this style of disk partitioning:
                     53: amd64, arc, bebox, cobalt, hpcarm, hpcmips, hpcsh, i386, macppc,
                     54: mvmeppc, netwinder, ofppc, playstation2, and prep.
                     55: .Pp
                     56: The MBR contains bootable code, a partition table,
                     57: an indication of which partition is
                     58: .Sq active ,
                     59: and (optionally, depending on the boot code) a menu
                     60: for selecting a partition to be booted.
1.35      dsl        61: There can be at most 4 partitions defined in sector 0,
                     62: one of which can be an extended
                     63: partition which can be split into any number of sub-partitions.
1.6       mycroft    64: .Pp
1.54      apb        65: The boot code in the MBR is usually invoked by the BIOS or firmware,
                     66: and the MBR passes control to the next stage boot code
                     67: stored in the first sector of the partition to be booted
                     68: (the
                     69: .Em "partition boot record"
                     70: or
                     71: .Em PBR ) .
                     72: .Pp
                     73: After booting,
1.13      perry      74: .Nx
1.35      dsl        75: does not use the partitioning done by
                     76: .Nm ,
                     77: instead it uses a
                     78: .Nx
                     79: disklabel saved in sector 1 of the
                     80: .Nx
                     81: partition.
1.54      apb        82: See
                     83: .Xr mbrlabel 8
                     84: for a way of using information from the MBR
                     85: to construct a
                     86: .Nx
                     87: disklabel.
1.1       cgd        88: .Pp
1.45      snj        89: The standard MBR boot code will only boot the
                     90: .Sq active
                     91: partition.
1.35      dsl        92: However
                     93: .Nx
1.59      dsl        94: contains additional boot programs which allow the user to
1.35      dsl        95: interactively select which of the partitions to boot.
1.45      snj        96: The
                     97: .Sq mbr_ext
1.59      dsl        98: code will also boot
1.13      perry      99: .Nx
1.35      dsl       100: from an extended partition but will not work on old systems that do not
1.59      dsl       101: support LBA reads, the
                    102: .Sq mbr_com0
                    103: and
                    104: .Sq mbr_com0_9600
                    105: will read and write from a serial port.
1.24      lukem     106: At the start the
                    107: .Nm
                    108: program will determine whether the disk sector 0 is valid as a boot sector.
                    109: (This is determined by checking the magic number.)
                    110: If not,
                    111: .Nm
1.35      dsl       112: will initialise the boot code as well as the partition table.
1.24      lukem     113: During this, all four partitions will be marked empty.
                    114: .Pp
1.1       cgd       115: The flags
1.9       phil      116: .Fl a ,
1.26      wiz       117: .Fl i
1.1       cgd       118: or
                    119: .Fl u
1.4       jtc       120: are used to indicate that the partition data is to be updated.
1.1       cgd       121: The
                    122: .Nm
1.24      lukem     123: program will enter an interactive conversational mode.
1.6       mycroft   124: This mode is designed not to change any data unless you explicitly tell it to;
1.1       cgd       125: .Nm
1.35      dsl       126: selects defaults for its questions to guarantee that behaviour.
1.1       cgd       127: .Pp
1.61      snj       128: If partition data is going to be updated and the disk carries GUID Partition
                    129: Tables,
1.60      christos  130: .Nm
                    131: will remove both primary and backup GPT headers from the disk.
                    132: See
                    133: .Xr gpt 8
                    134: for information on how to manipulate GUID Partition Tables.
                    135: .Pp
1.35      dsl       136: .Nm
                    137: will calculate the correct
1.11      lukem     138: .Em cylinder ,
                    139: .Em head ,
1.1       cgd       140: and
1.11      lukem     141: .Em sector
1.38      wiz       142: values for any partition you edit.
                    143: If you specify
1.35      dsl       144: .Fl v
                    145: you will be asked whether you want to specify them yourself.
1.1       cgd       146: .Pp
1.35      dsl       147: Finally, when all the data for the first sector has been accumulated,
1.6       mycroft   148: .Nm
1.35      dsl       149: will ask if you really want to write the new partition table.
1.6       mycroft   150: Only if you reply affirmatively to this question will
                    151: .Nm
                    152: write anything to the disk.
1.1       cgd       153: .Pp
1.24      lukem     154: Available options:
1.18      fvdl      155: .Pp
1.24      lukem     156: .Bl -tag -width Ds
                    157: .It Fl 0
1.64      tsutsui   158: Specify partition slot 0 to be printed or updated.
1.24      lukem     159: .It Fl 1
1.64      tsutsui   160: Specify partition slot 1 to be printed or updated.
1.24      lukem     161: .It Fl 2
1.64      tsutsui   162: Specify partition slot 2 to be printed or updated.
1.24      lukem     163: .It Fl 3
1.64      tsutsui   164: Specify partition slot 3 to be printed or updated.
1.24      lukem     165: .It Fl a
                    166: Change the active partition.
                    167: In interactive mode this question will be asked after the partitions
                    168: have been processed.
                    169: .It Fl b Ar cylinders/heads/sectors
                    170: Specify the BIOS parameters for
                    171: .Ar cylinders ,
1.38      wiz       172: .Ar heads ,
1.10      phil      173: and
1.24      lukem     174: .Ar sectors .
                    175: It is used only in conjunction with the
1.10      phil      176: .Fl u
1.15      ws        177: flag.
1.24      lukem     178: .It Fl B
1.35      dsl       179: On an i386 or amd64 system, interactively update the boot selector settings.
1.32      perry     180: (The boot selector permits the user to interactively select the boot
                    181: partition, and thus which operating system is run, at system boot time.
1.33      wiz       182: See
1.32      perry     183: .Xr mbr 8
                    184: for more information.)
1.24      lukem     185: .It Fl c Ar bootcode
                    186: Specify the filename that
                    187: .Nm
                    188: should read the bootcode from.
1.35      dsl       189: If the name of a directory is specified, then
                    190: .Nm
                    191: will look for files with the default names in that directory.
1.24      lukem     192: The default is to read from
1.35      dsl       193: .Pa /usr/mdec/mbr ,
                    194: .Pa /usr/mdec/mbr_bootsel
                    195: or
                    196: .Pa /usr/mdec/mbr_ext
                    197: depending on whether
1.40      dsl       198: .Ar bootmenu
1.35      dsl       199: was specified for any partitions
                    200: on an i386 machine, and leave the bootcode empty for other
1.24      lukem     201: machines.
1.35      dsl       202: .It Fl E Ar number
1.64      tsutsui   203: Specify extended partition
                    204: .Ar number
                    205: to be printed or updated.
                    206: If the specified extended partition doesn't exist on updating partition data
                    207: an additional extended partition will be created.
1.24      lukem     208: .It Fl f
                    209: Run
1.9       phil      210: .Nm
1.24      lukem     211: in a non-interactive mode.
1.26      wiz       212: In this mode, you can only change the disk parameters by using the
1.10      phil      213: .Fl b
1.24      lukem     214: flag.
                    215: This is provided only so scripts or other programs may use
                    216: .Nm
                    217: as part of an automatic installation process.
1.47      lukem     218: .Pp
1.24      lukem     219: Using the
1.9       phil      220: .Fl f
1.12      ross      221: flag with
1.9       phil      222: .Fl u
1.10      phil      223: makes it impossible to specify the starting and ending
1.24      lukem     224: .Ar cylinder ,
1.38      wiz       225: .Ar head ,
1.26      wiz       226: and
1.24      lukem     227: .Ar sector
1.64      tsutsui   228: fields
                    229: .Pq only Ar start No and Ar size No can be specified by Fl s No option .
1.24      lukem     230: They will be automatically computed using the BIOS geometry.
1.45      snj       231: .It Fl F
1.44      dyoung    232: Indicate that
                    233: .Ar device
1.45      snj       234: is a regular file.
                    235: Unless the geometry of
1.44      dyoung    236: .Ar device
                    237: is told to
1.46      wiz       238: .Nm
1.44      dyoung    239: by
                    240: .Fl T Ar disktype ,
1.46      wiz       241: .Nm
1.44      dyoung    242: will count the 512-byte sectors in
                    243: .Ar device
                    244: and produce a fake geometry.
1.24      lukem     245: .It Fl i
1.35      dsl       246: Explicitly request initialisation of the master boot code
1.24      lukem     247: (similar to what
1.46      wiz       248: .Ic fdisk /mbr
1.24      lukem     249: does under
1.43      lukem     250: .Tn MS-DOS ) ,
1.26      wiz       251: even if the magic number in the first sector is ok.
1.24      lukem     252: The partition table is left alone by this (but see above).
1.30      christos  253: .It Fl l
                    254: Lists known
                    255: .Em sysid
                    256: values and exit.
1.35      dsl       257: .It Fl r Ar file
                    258: Read the boot record from file
                    259: .Ar file
                    260: instead of the specified disk.
                    261: The geometry information used is still that of the disk volume.
                    262: Any changes are written back to the file.
1.38      wiz       263: .It Fl s Ar id/start/size Ns Bq Ar /bootmenu
1.24      lukem     264: Specify the partition
                    265: .Ar id ,
1.35      dsl       266: .Ar start ,
1.38      wiz       267: .Ar size ,
1.35      dsl       268: and optionally
                    269: .Ar bootmenu .
1.24      lukem     270: This flag requires the use of a partition selection flag
1.64      tsutsui   271: .Pq Fl 0 , 1 , 2 , 3 , No or Fl E Ar number .
1.24      lukem     272: .It Fl S
1.26      wiz       273: When used with no other flags print a series of
1.24      lukem     274: .Pa /bin/sh
                    275: commands for setting variables to the partition information.
1.35      dsl       276: This could be used by installation scripts.
1.44      dyoung    277: .It Fl t Ar disktab
1.45      snj       278: Read
1.44      dyoung    279: .Ar disktype
1.45      snj       280: from the named
                    281: .Xr disktab 5
1.44      dyoung    282: file instead of from
1.45      snj       283: .Pa /etc/disktab .
1.44      dyoung    284: .It Fl T Ar disktype
1.45      snj       285: Use the disklabel
1.44      dyoung    286: .Ar disktype
                    287: instead of the disklabel on
                    288: .Ar device .
1.24      lukem     289: .It Fl u
1.64      tsutsui   290: Update partition data, including
                    291: .Em id , start , No and Em size .
                    292: Unless
                    293: .Fl f
                    294: option
                    295: .Pq non-interactive mode
                    296: is specified,
                    297: .Nm
                    298: will display the partitions and interactively ask which one you want to edit.
1.24      lukem     299: .Nm
1.35      dsl       300: will step through each field showing the old value and asking for a new one.
                    301: The
                    302: .Em start
1.36      wiz       303: and
1.35      dsl       304: .Em size
1.65      tsutsui   305: can be specified in blocks (NN),
                    306: cylinders (NNc or NNcyl),
                    307: megabytes (NNm or NNMB),
                    308: or gigabytes (NNg or NNGB), values in megabytes and gigabytes
1.51      dsl       309: will be rounded to the nearest cylinder boundary.
1.35      dsl       310: The
                    311: .Em size
                    312: may be specified as
                    313: .Em $
                    314: in which case the partition will extend to the end of the available free space.
1.47      lukem     315: .Pp
1.64      tsutsui   316: In a non-interactive mode
                    317: .Pq specified by Fl f No option ,
                    318: partition data should be specified by
                    319: .Fl s
                    320: option.
                    321: A partition selection option
                    322: .Pq Fl 0 , 1 , 2 , 3 , No or Fl E Ar number
                    323: should also be specified to select a partition slot to be updated.
                    324: .Pp
1.35      dsl       325: .Nm
                    326: will not allow you to create partitions which overlap.
1.64      tsutsui   327: If
                    328: .Fl u
                    329: and
                    330: .Fl s
                    331: are specified in a non-interactive mode
                    332: then the details of the specified partition will be changed.
                    333: Any other partitions which overlap the requested part of the disk will be
                    334: silently deleted.
1.35      dsl       335: .Pp
                    336: If
                    337: .Em bootmenu
                    338: is specified for any partition
                    339: .Nm
                    340: will determine whether the installed boot code supports the bootselect code,
                    341: if it doesn't you will be asked whether you want to install the required
1.53      wiz       342: boot code.
                    343: To remove a
1.52      jmcneill  344: .Em bootmenu
1.53      wiz       345: label, simply press
                    346: .Aq space
                    347: followed by
                    348: .Aq return .
1.35      dsl       349: .It Fl v
                    350: Be more verbose, specifying
                    351: .Fl v
                    352: more than once may increase the amount of output.
1.47      lukem     353: .Pp
                    354: Using
1.35      dsl       355: .Fl v
                    356: with
                    357: .Fl u
1.47      lukem     358: allows the user to change more parameters than normally permitted.
1.35      dsl       359: .It Fl w Ar file
                    360: Write the modified partition table to file
                    361: .Ar file
                    362: instead of the disk.
                    363: .El
                    364: .Pp
                    365: When called with no arguments, it prints the partition table.
                    366: An example follows:
                    367: .Bd -literal
                    368:     Disk: /dev/rwd0d
                    369:     NetBSD disklabel disk geometry:
                    370:     cylinders: 16383, heads: 16, sectors/track: 63 (1008 sectors/cylinder)
                    371:     total sectors: 40032696
                    372:
                    373:     BIOS disk geometry:
                    374:     cylinders: 1023, heads: 255, sectors/track: 63 (16065 sectors/cylinder)
                    375:     total sectors: 40032696
                    376:
                    377:     Partition table:
                    378:     0: NetBSD (sysid 169)
                    379:        bootmenu: net 1.5.
                    380:        start 4209030, size 8289540 (4048 MB, Cyls 262-778), Active
                    381:     1: Primary DOS with 32 bit FAT (sysid 11)
                    382:        bootmenu: win98
                    383:        start 63, size 4208967 (2055 MB, Cyls 0-262)
                    384:     2: NetBSD (sysid 169)
                    385:        bootmenu: current
                    386:        start 32515560, size 7517136 (3670 MB, Cyls 2024-2491/234/40)
                    387:     3: Ext. partition - LBA (sysid 15)
                    388:        start 12498570, size 20016990 (9774 MB, Cyls 778-2024)
                    389:     Extended partition table:
                    390:     E0: NetBSD (sysid 169)
                    391:        bootmenu: test
                    392:        start 12498633, size 12305727 (6009 MB, Cyls 778-1544)
                    393:     E1: Primary DOS with 32 bit FAT (sysid 11)
                    394:        start 24804423, size 4096512 (2000 MB, Cyls 1544-1799)
                    395:     E2: Primary DOS with 32 bit FAT (sysid 11)
                    396:        start 28900998, size 3614562 (1765 MB, Cyls 1799-2024)
                    397:     Bootselector enabled, infinite timeout.
1.57      apb       398:     First active partition: 0
1.35      dsl       399: .Ed
                    400: .Pp
                    401: This example disk is divided into four partitions the last of which is
                    402: an extended partition.
                    403: The sub-partitions of the extended partition are also shown.
                    404: In this case there is no free space in either the disk or in the extended
                    405: partition.
                    406: .Pp
                    407: The various fields in each partition entry are:
                    408: .br
                    409: .in +4
                    410: .Em ptn_number : id_name
                    411: (sysid
                    412: .Em id_number )
                    413: .br
                    414: .in +4
                    415: bootmenu:
                    416: .Em bootmenu
                    417: .br
                    418: start
                    419: .Em start ,
                    420: size
1.39      wiz       421: .Em size ( MB
1.35      dsl       422: MB, Cyls
1.39      wiz       423: .Em first Ns No - Ns Em next )
1.35      dsl       424: .Op , Active
                    425: .in -4
                    426: .in -4
                    427: .Bl -tag -width "bootmenu"
                    428: .It Em ptn_number
                    429: is the number of the partition.
                    430: .It Em id_name
                    431: is the name of the filesystem type or operating system that uses this partition.
                    432: .It Em id_number
                    433: is the number that identifies the partition type.
                    434: 169 decimal is used for
                    435: .Nx
                    436: partitions,
                    437: 15 decimal to create an extended partition
                    438: and 0 to mark a partition as unused.
                    439: Use
1.24      lukem     440: .Nm
1.35      dsl       441: .Fl l
                    442: to list the known partition types.
                    443: .It Em bootmenu
                    444: is the menu prompt output by the interactive boot code for this partition.
                    445: This line is omitted if the prompt is not defined.
1.63      joerg     446: .It Em start , Em size
1.35      dsl       447: are the start address and size of the partition in sectors.
                    448: .It Em MB
                    449: is the size of the partition in megabytes.
1.63      joerg     450: .It Em first , Em next
1.35      dsl       451: are the bounds of this partition displayed as cylinder/head/sector.
                    452: If the partition starts (or ends) on a cylinder boundary the head and
                    453: sector values are omitted.
1.36      wiz       454: If
1.35      dsl       455: .Fl v
                    456: is not specified the start of extended partitions and the first partition
                    457: on the disk are rounded down to include the mandatory red tape in the
1.45      snj       458: preceding track.
1.35      dsl       459: .It Active
                    460: is output if this is the active partition.
                    461: .El
                    462: .Pp
                    463: If the
                    464: .Fl v
1.56      wiz       465: flag is specified, the beginning and end of each partition are also
1.54      apb       466: displayed as follows:
1.35      dsl       467: .in +4
                    468: beg: cylinder
                    469: .Em cylinder ,
                    470: head
                    471: .Em head ,
                    472: sector
                    473: .Em sector
                    474: .br
                    475: end: cylinder
                    476: .Em cylinder ,
                    477: head
                    478: .Em head ,
                    479: sector
                    480: .Em sector
                    481: .in -4
                    482: .Bl -tag -width "bootmenu"
1.63      joerg     483: .It Em "cylinder" , Em "head" , Em "sector"
1.35      dsl       484: are the beginning or ending address of a partition.
1.47      lukem     485: .Pp
1.35      dsl       486: .Em "Note:"
                    487: these numbers are read from the bootblock, so are the values calculated
                    488: by a previous run of
                    489: .Nm .
1.24      lukem     490: .El
1.54      apb       491: .Pp
                    492: .Nm
                    493: attempts to check whether each partition is bootable,
                    494: by checking the magic number and some other characteristics
                    495: of the first sector of each partition (the PBR).
                    496: If the partition does not apear to be bootable,
                    497: .Nm
                    498: will print a line containing
                    499: .Dq "PBR is not bootable"
                    500: followed by an error message.
                    501: If the partition is bootable, and if the
                    502: .Fl v
                    503: flag is specified,
                    504: .Nm
                    505: will print
                    506: .Dq "PBR appears to be bootable" .
                    507: If the
                    508: .Fl v
                    509: flag is specified more than once,
                    510: .Nm
                    511: will print the heading
                    512: .Dq "Information from PBR:"
                    513: followed by one or more lines of information gleaned from the PBR;
                    514: this additional information may be incorrect or misleading,
                    515: because different operating systems use different PBR formats.
                    516: Note that, even if no errors are reported, an attempt to boot
                    517: from the partition might fail.
                    518: .Nx
                    519: partitions may be made bootable using
                    520: .Xr installboot 8 .
1.1       cgd       521: .Sh NOTES
1.48      darcy     522: This program is only available (and useful) on systems with PC-platform-style
1.49      wiz       523: MBR partitioning.
1.48      darcy     524: .Pp
1.35      dsl       525: Traditionally the partition boundaries should be on cylinder boundaries
1.58      apb       526: using the BIOS geometry, with the exception of the first partition,
                    527: which traditionally begins in the second track of the first cylinder
                    528: (cylinder 0, head 1, sector 1).
1.35      dsl       529: Although the BIOS geometry is typically different from the geometry
                    530: reported by the drive, neither will match the actual physical geometry
                    531: for modern disks (the actual geometry will vary across the disk).
                    532: Keeping the partition boundaries on cylinder boundaries makes partitioning
                    533: a driver easier as only relatively small numbers need be entered.
                    534: .Pp
1.12      ross      535: The automatic calculation of the starting cylinder and
                    536: other parameters uses
1.1       cgd       537: a set of figures that represent what the BIOS thinks is the
                    538: geometry of the drive.
1.35      dsl       539: The default values should be correct for the system on which
                    540: .Nm
                    541: is run, however if you move the disk to a different system the
                    542: BIOS of that system might use a different geometry translation.
                    543: .Pp
                    544: If you run the equivalent of
1.6       mycroft   545: .Nm
1.35      dsl       546: on a different operating system then the
1.40      dsl       547: .Ar bootmenu
1.35      dsl       548: strings associated with extended partitions may be lost.
1.1       cgd       549: .Pp
1.6       mycroft   550: Editing an existing partition is risky, and may cause you to
1.1       cgd       551: lose all the data in that partition.
                    552: .Pp
                    553: You should run this program interactively once or twice to see how it works.
                    554: This is completely safe as long as you answer the last question in the negative.
1.35      dsl       555: You can also specify
                    556: .Fl w Ar file
                    557: to write the output to a file and later specify
                    558: .Fl r Ar file
                    559: to read back the updated information.
                    560: This can be done without having write access to the disk volume.
1.16      ws        561: .Sh FILES
1.18      fvdl      562: .Bl -tag -width /usr/mdec/mbrxxxxxxxx -compact
1.16      ws        563: .It Pa /usr/mdec/mbr
                    564: Default location of i386 bootcode
1.18      fvdl      565: .It Pa /usr/mdec/mbr_bootsel
                    566: Default location of i386 bootselect code
1.35      dsl       567: .It Pa /usr/mdec/mbr_ext
                    568: Default location of i386 bootselect for extended partitions
1.16      ws        569: .El
1.62      yamt      570: .Sh EXAMPLES
1.66    ! tsutsui   571: Update MBR partition data of
        !           572: .Pa /dev/rwd0d
        !           573: in interactive mode:
        !           574: .Pp
        !           575: .Dl Ic fdisk -u /dev/rwd0d
        !           576: .Pp
        !           577: Change active MBR partition of
        !           578: .Pa /dev/rwd0d
        !           579: in interactive mode:
        !           580: .Pp
        !           581: .Dl Ic fdisk -a /dev/rwd0d
        !           582: .Pp
        !           583: Install MBR bootcode
        !           584: .Pa /usr/mdec/mbr_bootsel
        !           585: into
        !           586: .Pa /dev/rwd0d :
        !           587: .Pp
        !           588: .Dl Ic fdisk -c /usr/mdec/mbr_bootsel /dev/rwd0d
        !           589: .Pp
        !           590: Set MBR partition data for slot 0 of
        !           591: .Pa /dev/rwd0d
        !           592: specifying values without prompt:
        !           593: .Pp
        !           594: .Dl Ic fdisk -f -u -0 -s 169/63/2097089 /dev/rwd0d
        !           595: .Pp
        !           596: Make partition slot 0 of
        !           597: .Pa /dev/rwd0d
        !           598: active without prompt:
        !           599: .Pp
        !           600: .Dl Ic fdisk -f -a -0 /dev/rwd0d
        !           601: .Pp
        !           602: Initialize and create MBR partition data using bootcode
        !           603: .Pa destdir/usr/mdec/mbr
        !           604: without prompt against 1GB disk image file
        !           605: .Pa diskimg :
        !           606: .Pp
        !           607: .Dl Ic fdisk -f -i -b 130/255/63 -c destdir/usr/mdec/mbr -F diskimg
        !           608: .Pp
        !           609: Create MBR partition data for slot 0 which has an active NetBSD partition
        !           610: using whole disk without prompt against 1GB disk image file
        !           611: .Pa diskimg :
        !           612: .Pp
        !           613: .Dl Ic fdisk -f -a -u -0 -s 169/63/2097089 -F diskimg
1.1       cgd       614: .Sh SEE ALSO
1.45      snj       615: .Xr disktab 5 ,
1.54      apb       616: .Xr boot 8 ,
1.23      abs       617: .Xr disklabel 8 ,
1.60      christos  618: .Xr gpt 8 ,
1.54      apb       619: .Xr installboot 8 ,
1.27      fair      620: .Xr mbr 8 ,
1.23      abs       621: .Xr mbrlabel 8
1.1       cgd       622: .Sh BUGS
1.45      snj       623: The word
                    624: .Sq partition
                    625: is used to mean both an MBR partition and a
1.35      dsl       626: .Nx
                    627: partition, sometimes in the same sentence.
                    628: .Pp
1.6       mycroft   629: There are subtleties that the program detects that are not explained in
                    630: this manual page.

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