Module Name: src
Committed By: dsl
Date: Wed Dec 23 20:56:18 UTC 2009
Modified Files:
src/sbin/fdisk: fdisk.8
Log Message:
Add info for -A ptn_alignment[/ptn_0_offset]
To generate a diff of this commit:
cvs rdiff -u -r1.68 -r1.69 src/sbin/fdisk/fdisk.8
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sbin/fdisk/fdisk.8
diff -u src/sbin/fdisk/fdisk.8:1.68 src/sbin/fdisk/fdisk.8:1.69
--- src/sbin/fdisk/fdisk.8:1.68 Thu Dec 17 14:27:49 2009
+++ src/sbin/fdisk/fdisk.8 Wed Dec 23 20:56:18 2009
@@ -1,6 +1,6 @@
-.\" $NetBSD: fdisk.8,v 1.68 2009/12/17 14:27:49 pooka Exp $
+.\" $NetBSD: fdisk.8,v 1.69 2009/12/23 20:56:18 dsl Exp $
.\"
-.Dd December 17, 2009
+.Dd December 23, 2009
.Dt FDISK 8
.Os
.Sh NAME
@@ -10,7 +10,7 @@
.Nm
.Op Fl afiuvBFS
.Bk -words
-.Op Fl 0 | 1 | 2 | 3
+.Op Fl 0 | 1 | 2 | 3 | E Ar number
.Ek
.Bk -words
.Op Fl t Ar disktab
@@ -19,7 +19,7 @@
.Op Fl T Ar disktype
.Ek
.Bk -words
-.Op Fl E Ar number
+.Op Fl A Ar ptn_alignment Ns Bq Ar /ptn_0_offset
.Ek
.Bk -words
.Op Fl b Ar cylinders/heads/sectors
@@ -166,8 +166,27 @@
Change the active partition.
In interactive mode this question will be asked after the partitions
have been processed.
+.It Fl A Ar ptn_alignment Ns Bq Ar /ptn_0_offset
+Specify the alignment for all partitions and optionally the offset for the
+first partition of the disk and of extended partitions.
+If
+.Ar ptn_alignment
+is specified and
+.Ar ptn_0_offset
+is not specified, then the offset is set to the alignment.
+If
+.Fl A
+isn't specified, then the alignment of the first partition is inspected.
+If it ends on a 2048 sector boundary, then the alignment is set to 2048,
+if the start is a power of 2 less than, or equal to 2048 then the offset
+is set to the start sector.
+If the first partition isn't defined then the alignment and offset for disks
+larger than 128GB is set to 2048 (1MB).
+In all other cases the alignment default to a cylinder
+and the offset to a track (both using the BIOS geometry).
+The 1MB alignment is the same as that used by recent windows versions.
.It Fl b Ar cylinders/heads/sectors
-Specify the BIOS parameters for
+Specify the BIOS geometry parameters for
.Ar cylinders ,
.Ar heads ,
and
@@ -175,6 +194,11 @@
It is used only in conjunction with the
.Fl u
flag.
+If not specified the BIOS geometry will be obtained using sysctl (i386 and
+amd64) or by solving the simultaenous equations from the existing partition
+information.
+If that fails then either the geometry from the disklabel or 63 sectors and
+16 heads is used.
.It Fl B
On an i386 or amd64 system, interactively update the boot selector settings.
(The boot selector permits the user to interactively select the boot
