I'm having difficulty finding a practical online resource that can bridge a 
gap in my understanding of how an ATA drive's file contents are reconciled 
to the drive's physical organization.  Using a PIC 18F452 setup (programmed 
in ASM) I can read a drive's status register and determine that the drive is 
present and ready, but I'm not sure how to obtain data from the MBR, or how 
to point the drive to a particular cluster and read its contents.  Googling 
pulls up all kinds of information regarding things like the contents of the 
boot sector and the FAT , but I'm at a loss to know how it boils down to 
which registers to load and which hardware lines to control in order to 
locate and read these contents.  I have found drafts of the ATA specs, but 
it's a huge document.  Has someone encountered a practical hardware-oriented 
ATA tutorial?

Many thanks,
RR 


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