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: Tue, 23 Nov 2010 17:20:09
Message-Id: 20101123171856.119ea200@karnak.local
1 On Tue, 23 Nov 2010 17:20:02 +0100, Peter Humphrey wrote about Re:
2 [gentoo-user] Boot partitions (WAS: migrating disks (from mounts to
3 disklabels:
5 >On Sunday 21 November 2010 16:22:15 David W Noon wrote:
6 >
7 >> What I suspect is in the remainder of that space is a hidden primary
8 >> partition containing a "transparent" bootstrap that augments the BIOS
9 >> and permits booting from a logical/extended partition. This would be
10 >> similar to the old OS/2 Boot Manager, although that was hardly
11 >> transparent. This hidden partition was probably placed there by
12 >> cfdisk when you first partitioned the drive and started it with an
13 >> extended partition. The OS/2 FDISK.COM did something similar when
14 >> the first partition on a drive was not a primary (including Boot
15 >> Manager).
16 >>
17 >> A forensic examination of that area would be of interest.
18 >
19 >Including attempting creation of three more primary partitions. If
20 >your hunch is right, the last will not be created as the allowable
21 >four exist already.
23 No, only 1 primary and Neil's extended partition would currently
24 exist. So it should be possible to create 2 more primaries, if there
25 were space on the disk.
27 >I don't believe your hunch is right though - it's just too complex to
28 >be worthwhile for any but a very few customers.
30 Not at all complex. OS/2 has had the option to work that way since
31 about 1987 on 80286 hardware (and written by Microsoft).
33 >Nobody's answered my parenthetical question though: why do SCSI and
34 >IDE interfaces allow different total numbers of partitions?
36 They don't.
38 The number of primary/extended partitions is limited to 4, and the
39 number of logical drives is limited by the size of the extended
40 partition. If you can fit more partitions onto one drive than another,
41 it is because either the drive is bigger or the partitions are smaller.
42 --
43 Regards,
45 Dave [RLU #314465]
46 *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
47 dwnoon@××××××××.com (David W Noon)
48 *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*


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Subject Author
Re: [gentoo-user] Boot partitions (WAS: migrating disks (from mounts to disklabels Mick <michaelkintzios@×××××.com>