linux-os (Dick Johnson) wrote:
I read it, and it's wrong. You don't bother to learn. I will
take one last hack at this and then drop it.
When a disk is first accessed, the BIOS reads the disk capacity.
That's all. This disk capacity is in 512-byte things called "sectors".
You don't bother to mention HOW it is wrong, so it appears it is you who
fail to learn. I will attempt once more to explain. When you call int
13 and ask it for C = 3, H = 4, S = 5, exactly which sector you get
depends very much on what the bios thinks the geometry of the disk is,
because the bios will translate 3/4/5 into a completely different value
before sending it to the drive. That translation is dependent entirely
on which fake geometry the bios chooses to report the disk has.
I illustrated this translation and you simply say it is wrong. If that
is the case then show how.
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