Gentoo Archives: gentoo-user

From: David W Noon <dwnoon@××××××××.com>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] Boot partitions (WAS: migrating disks (from mounts to disklabels
Date: Sun, 21 Nov 2010 16:23:31
Message-Id: 20101121162215.13ab437c@karnak.local
1 On Sun, 21 Nov 2010 01:10:02 +0100, Neil Bothwick wrote about Re:
2 [gentoo-user] Boot partitions (WAS: migrating disks (from mounts to
3 disklabels:
5 >On Sat, 20 Nov 2010 16:53:25 +0000, David W Noon wrote:
6 [snip]
7 >> Your extended partition begins at sector 124. Any idea what is
8 >> occupying sectors 0 - 123 ?
9 >
10 >No idea, I used cfdisk, which must have decided it was a good idea to
11 >leave that area untouched. It doesn't show as free space.
13 Well, sector 0 holds the MBR for the entire disk. But everybody reading
14 this mailing list would have known that.
16 What I suspect is in the remainder of that space is a hidden primary
17 partition containing a "transparent" bootstrap that augments the BIOS
18 and permits booting from a logical/extended partition. This would be
19 similar to the old OS/2 Boot Manager, although that was hardly
20 transparent. This hidden partition was probably placed there by cfdisk
21 when you first partitioned the drive and started it with an extended
22 partition. The OS/2 FDISK.COM did something similar when the first
23 partition on a drive was not a primary (including Boot Manager).
25 A forensic examination of that area would be of interest.
26 --
27 Regards,
29 Dave [RLU #314465]
30 *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
31 dwnoon@××××××××.com (David W Noon)
32 *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*


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Re: [gentoo-user] Boot partitions (WAS: migrating disks (from mounts to disklabels Peter Humphrey <peter@××××××××××××××.org>