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Ok... I am a bit confused. What actually makes a FAT filesystem, a FAT filesystem? Is it the BPB? Because that just doesn't seem right to me. How would I make a FAT filesystem on the same floppy as my bootloader? Would I create a FAT filesystem on the floppy first, and then write the bootloader to the bootsector with the BPB?! Any help appreciated, thanks

Ahhhh think I have sorted it Write the FAT filesystem to the disk, then overwrite the bootsector, with my bootcode including the BPB

The 'Operating System Resource Center' (see quicklinkz) comes with full description of the FAT filesystem. Make sure you get them