241 lines
6.4 KiB
Groff
241 lines
6.4 KiB
Groff
.\" $NetBSD: pdisk.8,v 1.17 2009/03/09 19:24:26 joerg Exp $
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.Dd April 24, 2003
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.Dt PDISK 8
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.Os
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.Sh NAME
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.Nm pdisk
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.Nd Apple partition table editor
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.Sh SYNOPSIS
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.Nm
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.Op Fl acdfhilLrv
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.Op Fl -abbr
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.Op Fl -compute_size
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.Op Fl -debug
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.Op Fl -fname
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.Op Fl -help
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.Op Fl -interactive
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.Op Fl -list Ar device
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.Op Fl -logical
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.Op Fl -readonly
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.Op Fl -version
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.Op Ar device ...
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.Sh DESCRIPTION
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.Nm
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is a menu driven program which partitions disks using the standard Apple
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disk partitioning scheme described in "Inside Macintosh: Devices".
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It does not support the Intel/DOS partitioning scheme supported by
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.Xr fdisk 8 .
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.Pp
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Supported options are:
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.Bl -tag -width "--compute_sizeXX" -compact
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.It Fl a
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.It Fl -abbr
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Abbreviate the partition types shown in the partition list.
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.It Fl c
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.It Fl -compute_size
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Causes
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.Nm
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to always ignore the device size listed in the partition table
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and compute the device size by other means.
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.It Fl d
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.It Fl -debug
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Turns on debugging.
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Doesn't add that much output, but does add a new command
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.Sq x
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to the editing commands that accesses an eclectic bunch of
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undocumented functionality.
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.It Fl f
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.It Fl -fname
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Show HFS volume names instead of partition name when available.
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.It Fl h
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.It Fl -help
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Prints a short help message.
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.It Fl i
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.It Fl -interactive
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Causes
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.Nm
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to go into an interactive mode similar to the MacOS version of the program.
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.It Fl l
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.It Fl -list Ar device
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.\"If no
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.\".Ar device
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.\"argument is given,
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.\".Nm
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.\"tries to list partition tables for all available hard drives.
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.\"Otherwise,
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.\".Nm
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.\"lists
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List
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the partition tables for the specified
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.Ar devices .
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.It Fl L
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.It Fl -logical
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Show partition limits in logical blocks.
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Default is physical blocks.
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.It Fl r
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.It Fl -readonly
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Prevents
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.Nm
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from writing to the device.
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.It Fl v
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.It Fl -version
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Prints the version number of
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.Nm .
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.El
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.Ss Editing Partition Tables
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An argument which is simply the name of a
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.Ar device
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indicates that
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.Nm
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should edit the partition table of that device.
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.Pp
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The current top level editing commands are:
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.Bd -unfilled -offset indent
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C (create with type also specified)
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c create new partition
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d delete a partition
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h command help
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i initialize partition map
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n (re)name a partition
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P (print ordered by base address)
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p print the partition table
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q quit editing (don't save changes)
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r reorder partition entry in map
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s change size of partition map
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t change the type of an existing partition
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w write the partition table
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.Ed
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.Pp
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Commands which take arguments prompt for each argument in turn.
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You can also type any number of the arguments separated by spaces
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and those prompts will be skipped.
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The only exception to typeahead are the confirmation prompts on the
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.Ic i
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and
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.Ic w
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commands,
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since if we expect you to confirm the decision, we shouldn't undermine
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that by allowing you to be precipitate about it.
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.Pp
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Partitions are always specified by their number,
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which is the index of the partition entry in the partition map.
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Most of the commands will change the index numbers of all partitions
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after the affected partition.
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You are advised to print the table as frequently as necessary.
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.Pp
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.\"Creating more than fifteen partitions is not advised.
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.\"There may be a bug in old linux kernels which causes
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.\"access to the whole disk fail if more than fifteen partitions are in the map.
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.\".Pp
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The
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.Ic c
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(create new partition) command is the only one with complicated arguments.
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The first argument is the base address (in blocks) of the partition.
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Besides a raw number, you can also specify a partition number followed
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by the letter
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.Sq p
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to indicate that the first block of the new partition should be the same
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as the first block of that existing free space partition.
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The second argument is the length of the partition in blocks.
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This can be a raw number or can be a partition number followed by the
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letter
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.Sq p
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to use the size of that partition or can be a number followed
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by
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.Sq k ,
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.Sq m ,
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or
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.Sq g
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to indicate the size in kilobytes, megabytes, or gigabytes respectively.
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(These are powers of 1024, of course, not powers of 1000.)
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The third argument is the name of the partition.
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This can be a single word without quotes, or a string surrounded by
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single or double quotes.
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The type of the created partition will be Apple_UNIX_SVR2, which is
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the correct type for use with
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.Nx .
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This command will prompt for the unix filesystem slice to set
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in the Block Zero Block bits.
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.Pp
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The
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.Ic C
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command is similar to the
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.Ic c
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command, with the addition of a partition type argument after the
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other arguments.
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Choosing a type of Apple_UNIX_SVR2 will prompt for
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the unix filesystem slice to set in the Block Zero Block bits.
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.Pp
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The
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.Ic i
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(initalize) command prompts for the size of the device.
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.\"This was done to get around a bug in the kernel where it reports the wrong
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.\"size for the device.
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.Pp
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The
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.Ic n
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(name) command allows the name of a partition to be changed.
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Note that the various "Apple_Driver" partitions depend
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on the name field for proper functioning.
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We are not aware of any other partition types with this limitation.
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.Pp
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The
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.Ic r
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(reorder) command allows the index number of partitions to be changed.
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The index numbers are constrained to be a contiguous sequence.
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.Pp
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The
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.Ic t
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(change partition type) command allows the type of a partition to be
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changed.
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Changing the type to Apple_UNIX_SVR2 will prompt for the
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unix filesystem slice to set in the Block Zero Block bits.
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.Pp
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The
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.Ic w
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(write) command writes the partition map out.
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.\"but there is currently a bug in the interaction between MkLinux and Mach
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.\"which causes the partition map not to be reinterpreted.
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In order to use the new partition map you must reboot.
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.Sh SEE ALSO
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.Xr fdisk 8 ,
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.Xr newfs 8
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.Sh HISTORY
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The
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.Nm
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utility was originally developed for MkLinux.
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.Sh AUTHORS
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.An Eryk Vershen
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.Sh BUGS
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Some people believe there should really be just one disk partitioning utility.
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.Pp
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.\".Nm
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.\"should be able to create HFS partitions that work.
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.\".Pp
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Filesystem volume names are out of place in a partition utility.
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This utility supports HFS volume names, but not volume names
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of any other filesystem types.
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.Pp
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The
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.Fl -logical
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option has not been heavily tested.
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.Pp
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.Nm
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will first try to use
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.Xr lseek 2
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with
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.Dv SEEK_END
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to compute the size of the device.
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If this fails, it will try a binary search using
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.Xr lseek 2
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and
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.Xr read 2
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to find the end of the device.
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This has been observed to fail on some raw disk devices.
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As a workaround, try using the block device instead.
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.Nm
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should probably read the disklabel using the
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.Dv DIOCGDINFO
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.Xr ioctl 2
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to get the device size instead.
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