Re: MSDOS before cyl 1024

From	Peter 'Shaggy' Haywood <phaywood@alphalink.com.au>
Newsgroups	comp.os.linux.misc
Subject	Re: MSDOS before cyl 1024
Date	2023-01-26 14:40 +1100
Organization	A noiseless patient Spider
Message-ID	<8a99aj-el1.ln1@jefferson.foo> (permalink)
References	<tqeats$456$4@reader2.panix.com> <tqk5d2$lha$4@reader2.panix.com>

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Groovy hepcat vjp2.at@at.BioStrategist.dot.dot.com was jivin' in
comp.os.linux.misc on Mon, 23 Jan 2023 07:13 am. It's a cool scene! Dig
it.

> So I can put an MSDOS 6.22 multiboot Gparted/Grub partition anywhere?

  Not if your machine doesn't support LBA mode. In that case your boot
loader and its files must be entirely within the first 1023 cylinders.
Your boot loader must be accessible to the BIOS.
  But if it does support LBA, then yes, you can put your boot partition
wherever you want[1].

> Should I expand te MBR and put it there?

  Huh? I'm afraid that doesn't make sense. The MBR (Master Boot Record)
is the first sector on the drive. It is 512 bytes long[2], and contains
the boot loader and partition table (assuming you're using the DOS
partitioning scheme, which is a pretty good assumption). You can't
expand it.

> I assume I can't revive the Win7 I smashed so am going to put XP like
> I did in 2010-14.

  I don't know why you'd want to run Losedows[3] 7 (or XP for that
matter), but to each his own! :)

  [1] Well, even with LBA mode DOS itself has a 32 bit LBA limit. This
means you have a limit of 4,294,967,296 sectors, for a grand total of
2TB. A DOS partition table has this limit, even if it's being used by
another operating system. So, if you have a drive greater than that,
you only get access to the first 2TB of it. There are other
partitioning schemes that support larger drives (eg. GPT), but DOS
doesn't support them.

  [2] Many hard drives these days actually have physical sectors greater
than the traditional 512 bytes, but a PC is so geared to using 512 byte
sectors that modern drives usually use a *logical* sector size of 512
bytes, so it appears to the system they have 512 byte sectors.

  [3] Microstuffed Losedows: a barely-operating system with which I will
never associate the word "win".

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MSDOS before cyl 1024 vjp2.at@at.BioStrategist.dot.dot.com - 2023-01-20 15:10 +0000
  Re: MSDOS before cyl 1024 Marco Moock <mo01@posteo.de> - 2023-01-20 19:04 +0100
  Re: MSDOS before cyl 1024 Vilmos Soti <vilmos@soti.ca> - 2023-01-21 03:00 -0800
    Re: MSDOS before cyl 1024 Marco Moock <mo01@posteo.de> - 2023-01-21 13:23 +0100
      Re: MSDOS before cyl 1024 The Natural Philosopher <tnp@invalid.invalid> - 2023-01-21 13:43 +0000
        Re: MSDOS before cyl 1024 "Carlos E.R." <robin_listas@es.invalid> - 2023-01-21 14:52 +0100
          Re: MSDOS before cyl 1024 Marco Moock <mo01@posteo.de> - 2023-01-21 17:24 +0100
            Re: MSDOS before cyl 1024 "Carlos E.R." <robin_listas@es.invalid> - 2023-01-21 20:32 +0100
              Re: MSDOS before cyl 1024 Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2023-01-21 19:50 +0000
                Re: MSDOS before cyl 1024 "Carlos E.R." <robin_listas@es.invalid> - 2023-01-21 21:16 +0100
                Re: MSDOS before cyl 1024 Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2023-01-21 20:45 +0000
                Re: MSDOS before cyl 1024 The Natural Philosopher <tnp@invalid.invalid> - 2023-01-22 09:39 +0000
              Re: MSDOS before cyl 1024 "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2023-01-21 15:53 -0500
                Re: MSDOS before cyl 1024 "Carlos E.R." <robin_listas@es.invalid> - 2023-01-22 04:47 +0100
              Re: MSDOS before cyl 1024 The Natural Philosopher <tnp@invalid.invalid> - 2023-01-22 09:35 +0000
                Re: MSDOS before cyl 1024 "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2023-01-22 05:08 -0500
          Re: MSDOS before cyl 1024 Peter 'Shaggy' Haywood <phaywood@alphalink.com.au> - 2023-01-22 21:33 +1100
            Re: MSDOS before cyl 1024 "Carlos E.R." <robin_listas@es.invalid> - 2023-01-22 14:29 +0100
  Re: MSDOS before cyl 1024 vjp2.at@at.BioStrategist.dot.dot.com - 2023-01-22 20:13 +0000
    Re: MSDOS before cyl 1024 Marco Moock <mo01@posteo.de> - 2023-01-23 10:08 +0100
    Re: MSDOS before cyl 1024 Peter 'Shaggy' Haywood <phaywood@alphalink.com.au> - 2023-01-26 14:40 +1100

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