Re: MSDOS before cyl 1024

From	"Carlos E.R." <robin_listas@es.invalid>
Newsgroups	comp.os.linux.misc
Subject	Re: MSDOS before cyl 1024
Date	2023-01-21 14:52 +0100
Message-ID	<ea7t9jx7k1.ln2@Telcontar.valinor> (permalink)
References	<tqeats$456$4@reader2.panix.com> <lq7cxgrw2k.fsf@mail.soti.ca> <tqglff$2ie4h$5@dont-email.me> <tqgq6a$2k44c$2@dont-email.me>

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On 2023-01-21 14:43, The Natural Philosopher wrote:
> On 21/01/2023 12:23, Marco Moock wrote:
>> Am 21.01.2023 um 03:00:51 Uhr schrieb Vilmos Soti:
>>
>>> vjp2.at@at.BioStrategist.dot.dot.com writes:
>>>
>>>> What is this about MSDOS partition must be before cylinder 1024?
>>>
>>> Old BIOS constraint. Long ago, the BIOS encoded the number of heads,
>>> cylinders, and sectors in only a few bytes. The cylinders were encoded
>>> in 10 bits.
>>>
>>> This is really old stuff -- maybe 40 year old stuff.
>>
>> True, but I dunno when BIOS implementations were changed. I assume late
>> 90s/early 2000s, but I dunno. Does anybody here know?
>>
>>>> How do you know on GParted?
>>>
>>> I am surprised that this pops up in 2023.
>>
>> Many documentation still mentions that issue, so people ask about it.
>>
> At one level or another faced with a disk the operating system or BIOS 
> needs to know how its laid out so there has to be one hard coded sector 
> - sector zero - to  bootstrap everything. That may contain almost 
> anything, I cant remember the boot sequence on a PC. But it has to be 
> understood by legacy BIOS as well as modern BIOS.

Old bios and software accessed disks specifying the cylinder, the head, 
and the sector. So does MsDOS.

Today they only specify the LBA sector.

Maybe FreeDos can use LBA, dunno.

-- 
Cheers, Carlos.

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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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