diff options
| -rw-r--r-- | sbin/fdisk/fdisk.8 | 149 |
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.) |