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Multiple "Visible" Primaries

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It has recently been brought to my attention that under Win98 (and its DOS 
7.1 version) and later Windows versions, and possibly as early as Win95, that 
multiple primary partitions lacking the hidden attribute are acceptable. For 
many years, more than a decade at least, maybe two, I have been under the 
impression, because of IBM BM behavior, and having read in newsgroups, email 
lists, OS/2 print media, and on the WWW, that this is not acceptable to DOS, 
and presumably to OS/2 and eCS.

I'm interested in knowing if members of the OS2/eCS community have been aware 
of this, for how long if so, and what if any ramifications this ability has 
had or may have on those who multiboot with Windows.

As proof to myself, I used DFSee to partition a 30G laptop HD as follows:

7331M 0x1C primary
6681M 0x1C primary
  251M 0x0C logical
3344M 0x83 logical
7003M 0x0C logical
4001M 0x0C primary/startable

I then booted a M$ DOS 7.1 floppy to:
1-FORMAT C: /S
2-FORMAT D:
3-FORMAT E:

after which I booted from C:, the last/4001M partition.

Next I changed the partitions with DFSee thus:
7331M 0x1C primary
6681M 0x0C primary/startable
  251M 0x0C logical
3344M 0x83 logical
7003M 0x0C logical
4001M 0x12 primary

Again I booted the same floppy and did FORMAT C: /S, after which I booted C:, 
the #2/6681M partition. After that I installed WinXP SP3 from CD onto 
#2/6681M C:. Windows assigned D: to #3/251M, E: to #5/7003M, and, as 
expected, nothing to #1/7331M, #3/251M or #6/4001M.

Next I changed the partitions with DFSee thus:
7331M 0x0C primary/startable
6681M 0x1C primary
  251M 0x0C logical
3344M 0x83 logical
7003M 0x0C logical
4001M 0x12 primary

Again I booted the same floppy and did FORMAT C: /S, after which I booted C:, 
the #1/7331M partition.

The real confirmation tests came next, where I alternately changed the active 
partition while having set both the #1/7331M & #2/6681M partitions to type 
0x0C, and booted successfully to both WinXP and DOS 7.1. As before, the 
active/boot partition became C:, the 0x0C logicals D: & E:, and the 
non-active 0x0C became F: (after moving the OM device from F: to R:). These 
assignments were confirmed by last setting #1/7331M active and booting the 
WinXP installation CD again, whereupon letters were assigned thus:

C: 7331M 0x0C primary/startable
F: 6681M 0x1C primary
D:  251M 0x0C logical
H: 3344M 0x83 logical
E: 7003M 0x0C logical
-- 4001M 0x12 primary

Now I'm contemplating an upgrade to eCS-latest, mostly to see how it would 
work out to replace the 0x12/4001M with eCS and use AiR-Boot instead of BM.
-- 
"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)

  Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/

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Thread

Multiple "Visible" Primaries Felix Miata <UgaddaBkidding.due2UCE@dev.nul> - 2012-11-26 15:22 -0500
  Re: Multiple "Visible" Primaries Paul Ratcliffe <abuse@orac12.clara34.co56.uk78> - 2012-11-26 21:30 +0000
    Re: Multiple "Visible" Primaries Felix Miata <UgaddaBkidding.due2UCE@dev.nul> - 2012-11-26 23:16 -0500
      Re: Multiple "Visible" Primaries "ivan" <ivanjt@free.fr> - 2012-11-27 16:19 +0000
        Re: Multiple "Visible" Primaries Felix Miata <UgaddaBkidding.due2UCE@dev.nul> - 2012-11-27 13:53 -0500
          Re: Multiple "Visible" Primaries "Peter J. Seymour" <Newsgroups@pjsey.demon.co.uk> - 2012-11-28 09:51 +0000
            Re: Multiple "Visible" Primaries Barry Landy <bl10nospam@cam.ac.uk> - 2012-11-28 10:41 +0000
            Re: Multiple "Visible" Primaries Paul Ratcliffe <abuse@orac12.clara34.co56.uk78> - 2012-12-16 23:58 +0000
              Re: Multiple "Visible" Primaries "Peter J. Seymour" <Newsgroups@pjsey.demon.co.uk> - 2012-12-17 08:18 +0000
        Re: Multiple "Visible" Primaries Paul Ratcliffe <abuse@orac12.clara34.co56.uk78> - 2012-12-16 23:55 +0000
      Re: Multiple "Visible" Primaries Paul Ratcliffe <abuse@orac12.clara34.co56.uk78> - 2012-12-16 23:53 +0000

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