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...on 1.0 (1995), the strategy for floppy emulation and HDD emulation is to _shift_up_ the pre-existing drive numbers and to inject the El Torito disk _before_ those pre-existing drive numbers. This is another reason why it makes sense to scan _upward_ instead of downward. You will get the _last-booted_ El Torito floppy or HDD. This has been the case for close to 17 years. 2. For no-emulation mode, it is completely up to the BIOS (or hook) as to which drive number is used, as long as it's >= 0x81. In EDD-4, it is suggested to use 0xA0 or anything else > 0x9A (26 drive letters...