Re: Operating system design questions
From: Kasper Dupont (kasperd_at_daimi.au.dk)
Date: 04/15/05
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Date: Fri, 15 Apr 2005 13:12:13 +0200
Tauno Voipio wrote:
>
> Yep - that's because the MBR will be moved to
> 0x600 - 0x7ff and DOS uses the partition table
> from there.
True, the MBR does get copied to that location.
But the partition table only takes up one eigth
of the MBR. And I'm pretty sure DOS uses segment
0070. But OK, I don't recall seeing any addresses
less than 0100 being used in that segment, which
means the partition table may still be intact
on address 0070:00BE-0070:00FD. But this sounds
like a weird way to access the partition table,
and a waste of 448 precious bytes of memory. (But
what would you expect from DOS anyway).
-- Kasper Dupont
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