>> I've never dug enough into it, but I've always been interested in what 
>> calls the MBR has to make to load sectors and what not.
> 
> http://en.wikipedia.org/wiki/INT_13#INT_13h_AH.3D02h:_Read_Sectors_From_Drive 

Well, yeah, those are the BIOS calls to read sectors from a disk while 
in real mode. But then, once you've grabbed enough blocks from disk in 
real mode *then* you can worry about entering protected mode and 
initialising a real filesystem driver, etc.

BTW, I believe Grub supports booting *any* OS that complies with a set 
of simple guidelines. It isn't just limited to booting Linux. (Although 
it won't boot Windoze - but it can call the Windoze bootloader 
automatically.)

And yes, *I* wish I had more time...!

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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