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authorJason McIntyre <jmc@cvs.openbsd.org>2005-04-30 09:27:45 +0000
committerJason McIntyre <jmc@cvs.openbsd.org>2005-04-30 09:27:45 +0000
commitae37295dedbeb17b39b9f216660c7aa8058e073e (patch)
tree0a38b8634d6c106206f14784c63ea1cb7d3b2568
parent006b4fb4beb661aede245ab8e1f4f75c37dad597 (diff)
various fixes;
-rw-r--r--sbin/fdisk/fdisk.8149
1 files changed, 74 insertions, 75 deletions
diff --git a/sbin/fdisk/fdisk.8 b/sbin/fdisk/fdisk.8
index 75debd75b7c..fd763d251a6 100644
--- a/sbin/fdisk/fdisk.8
+++ b/sbin/fdisk/fdisk.8
@@ -1,4 +1,4 @@
-.\" $OpenBSD: fdisk.8,v 1.47 2005/04/30 07:10:13 deraadt Exp $
+.\" $OpenBSD: fdisk.8,v 1.48 2005/04/30 09:27:44 jmc Exp $
.\"
.\" Copyright (c) 1997 Tobias Weingartner
.\" All rights reserved.
@@ -57,36 +57,36 @@ place of the original (MBR) boot block.
.Pp
Some other architectures (like the zaurus), consider sector 0 of the disk
to contain the MBR partition table, but do not use the MBR bootcode at all.
-.Pp
.Sh TYPICAL LAYOUT
When called with no special flags,
.Nm
prints the MBR partition table of the specified device, i.e.,
-.Bd -literal
- # fdisk wd0
- Disk: wd0 geometry: 5168/240/63 [78140160 Sectors]
- Offset: 0 Signature: 0xAA55
- Starting Ending LBA Info:
- #: id C H S - C H S [ start: size ]
- ------------------------------------------------------------------------
- 0: 04 0 1 1 - 169 239 63 [ 63: 2570337 ] DOS FAT-16
- 1: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
- 2: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
- *3: A6 170 1 1 - 5167 239 63 [ 2570463: 75569697 ] OpenBSD
+.Bd -literal -offset 1n
+# fdisk wd0
+Disk: wd0 geometry: 5168/240/63 [78140160 Sectors]
+Offset: 0 Signature: 0xAA55
+ Starting Ending LBA Info:
+ #: id C H S - C H S [ start: size ]
+------------------------------------------------------------------------
+ 0: 04 0 1 1 - 169 239 63 [ 63: 2570337 ] DOS FAT-16
+ 1: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
+ 2: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
+*3: A6 170 1 1 - 5167 239 63 [ 2570463: 75569697 ] OpenBSD
.Ed
.Pp
This 78140160 sector (38154MB) disk drive is divided into two MBR
partitions that span the whole disk.
The first MBR partition is a 1225MB FAT-16 DOS partition
(in this case containing a Phoenix BIOS Laptop Suspend-to-Disk file),
-the second is a 36GB OpenBSD MBR partition using the remainder of the disk.
+the second is a 36GB
+.Ox
+MBR partition using the remainder of the disk.
The fields of the output are thus:
-.Pp
.Bl -tag -width "start/size"
.It Em "#"
Number identifying each MBR partition table entry.
There are a total of four slots.
-.Dq \&*
+.Sq *
denotes the MBR partition which is declared bootable.
.It Em "id"
MBR partition type identifier.
@@ -113,68 +113,69 @@ but the start field is
.Dq 0 based .
The CHS values will need to be in the BIOS's geometry
for the system to be able to boot and use the drive correctly.
-These values must be kept correctly syncronized or a variety of
+These values must be kept correctly synchronized or a variety of
problems develop which are very difficult to diagnose.
.Pp
-The OpenBSD MBR partition shown above is subdivided further using the
+The
+.Ox
+MBR partition shown above is subdivided further using the
functionality provided by
-.Xr disklabel 8 Ns ,
+.Xr disklabel 8 ,
which provides
.Ox
partitions.
-.Bd -literal
- # Inside MBR partition 3: type A6 start 2570463 size 75569697
- # /dev/rwd0c:
- type: ESDI
- disk: ESDI/IDE disk
- label: HITACHI_DK13FA-4
- flags:
- bytes/sector: 512
- sectors/track: 63
- tracks/cylinder: 16
- sectors/cylinder: 1008
- cylinders: 16383
- total sectors: 78140160
- rpm: 3600
- interleave: 1
- trackskew: 0
- cylinderskew: 0
- headswitch: 0 # microseconds
- track-to-track seek: 0 # microseconds
- drivedata: 0
-
- 16 partitions:
- # size offset fstype [fsize bsize cpg]
- a: 1740753 2570463 4.2BSD 2048 16384 328 # Cyl 2550*- 4276
- b: 819504 4311216 swap # Cyl 4277 - 5089
- c: 78140160 0 unused 0 0 # Cyl 0 - 77519
- d: 2097648 5130720 4.2BSD 2048 16384 328 # Cyl 5090 - 7170
- e: 614880 7228368 4.2BSD 2048 16384 328 # Cyl 7171 - 7780
- g: 2097648 7843248 4.2BSD 2048 16384 328 # Cyl 7781 - 9861
- h: 921312 9940896 4.2BSD 2048 16384 328 # Cyl 9862 - 10775
- i: 2570337 63 MSDOS # Cyl 0*- 2549
- j: 3355632 10862208 4.2BSD 2048 16384 328 # Cyl 10776 - 14104
- k: 2097648 14217840 4.2BSD 2048 16384 328 # Cyl 14105 - 16185
- l: 2097648 16315488 4.2BSD 2048 16384 328 # Cyl 16186 - 18266
- m: 59727024 18413136 4.2BSD 2048 16384 328 # Cyl 18267 - 77519
+.Bd -literal -offset 1n
+# Inside MBR partition 3: type A6 start 2570463 size 75569697
+# /dev/rwd0c:
+type: ESDI
+disk: ESDI/IDE disk
+label: HITACHI_DK13FA-4
+flags:
+bytes/sector: 512
+sectors/track: 63
+tracks/cylinder: 16
+sectors/cylinder: 1008
+cylinders: 16383
+total sectors: 78140160
+rpm: 3600
+interleave: 1
+trackskew: 0
+cylinderskew: 0
+headswitch: 0 # microseconds
+track-to-track seek: 0 # microseconds
+drivedata: 0
+
+16 partitions:
+# size offset fstype [fsize bsize cpg]
+ a: 1740753 2570463 4.2BSD 2048 16384 328 # Cyl 2550*- 4276
+ b: 819504 4311216 swap # Cyl 4277 - 5089
+ c: 78140160 0 unused 0 0 # Cyl 0 - 77519
+ d: 2097648 5130720 4.2BSD 2048 16384 328 # Cyl 5090 - 7170
+ e: 614880 7228368 4.2BSD 2048 16384 328 # Cyl 7171 - 7780
+ g: 2097648 7843248 4.2BSD 2048 16384 328 # Cyl 7781 - 9861
+ h: 921312 9940896 4.2BSD 2048 16384 328 # Cyl 9862 - 10775
+ i: 2570337 63 MSDOS # Cyl 0*- 2549
+ j: 3355632 10862208 4.2BSD 2048 16384 328 # Cyl 10776 - 14104
+ k: 2097648 14217840 4.2BSD 2048 16384 328 # Cyl 14105 - 16185
+ l: 2097648 16315488 4.2BSD 2048 16384 328 # Cyl 16186 - 18266
+ m: 59727024 18413136 4.2BSD 2048 16384 328 # Cyl 18267 - 77519
.Ed
.Pp
These
.Ox
partitions are then mounted as follows using
-.Pa /etc/fstab Ns :
-.Bd -literal
- /dev/wd0a / ffs rw,softdep 1 1
- /dev/wd0m /home ffs rw,softdep,nodev,nosuid 1 2
- /dev/wd0d /tmp ffs rw,softdep,nodev,nosuid 1 2
- /dev/wd0g /usr ffs rw,softdep,nodev 1 2
- /dev/wd0h /usr/X11R6 ffs rw,softdep,nodev 1 2
- /dev/wd0j /usr/local ffs rw,softdep,nodev 1 2
- /dev/wd0k /usr/obj ffs rw,softdep,nodev,nosuid 1 2
- /dev/wd0l /usr/src ffs rw,softdep,nodev,nosuid 1 2
- /dev/wd0e /var ffs rw,softdep,nodev,nosuid 1 2
+.Pa /etc/fstab :
+.Bd -literal -offset indent
+/dev/wd0a / ffs rw,softdep 1 1
+/dev/wd0m /home ffs rw,softdep,nodev,nosuid 1 2
+/dev/wd0d /tmp ffs rw,softdep,nodev,nosuid 1 2
+/dev/wd0g /usr ffs rw,softdep,nodev 1 2
+/dev/wd0h /usr/X11R6 ffs rw,softdep,nodev 1 2
+/dev/wd0j /usr/local ffs rw,softdep,nodev 1 2
+/dev/wd0k /usr/obj ffs rw,softdep,nodev,nosuid 1 2
+/dev/wd0l /usr/src ffs rw,softdep,nodev,nosuid 1 2
+/dev/wd0e /var ffs rw,softdep,nodev,nosuid 1 2
.Ed
-.Pp
.Sh OPTIONS
The options are as follows:
.Bl -tag -width Ds
@@ -189,7 +190,7 @@ By default, an automatic calculation of disk size will be built
using heuristics.
These figures are taken from the in-core disklabel
(see
-.Xr disklabel 8 Ns ),
+.Xr disklabel 8 ) ,
or values that
.Em /boot
has passed to the kernel.
@@ -230,7 +231,6 @@ equivalent to the DOS command
.Dq FDISK /MBR .
Note that this option will overwrite the NT disk signature, if present.
.El
-.Pp
.Sh COMMAND MODE
The
.Fl e
@@ -239,11 +239,11 @@ flag causes
to enter an interactive command mode.
The prompt contains information about the state of the edit
process.
-.Bd -literal
- fdisk:*0>
-.Ed
.Pp
-* means that the in-memory copy of the boot block has been modified, but
+.Dl fdisk:*0>
+.Pp
+.Sq *
+means that the in-memory copy of the boot block has been modified, but
not yet written to disk.
.Pp
0 is the disk offset of the currently selected boot block being edited.
@@ -284,7 +284,7 @@ Only one entry can be marked bootable.
.It update
Update the machine MBR bootcode and 0xAA55 signature in the memory copy
of the currently selected boot block.
-Note that this option will overwrite the NT disk
+Note that this option will overwrite an NT disk
signature, if present.
.It select Ar #
Select and load into memory the boot block pointed
@@ -321,9 +321,8 @@ it does write the modified block out.
Quit program without saving current changes.
.El
.Sh NOTES
-.Pp
Hand crafted disk layouts can be highly error prone;
-ensure that
+ensure that the
.Ox
MBR partition starts on a cylinder boundary.
(This restriction may be changed in the future.)