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The concept of the SAN drive number is meaningful only in a BIOS environment, where it represents the INT13 drive number (0x80 for the first hard disk). We retain this concept in a UEFI environment to allow for a simple way for iPXE commands to refer to SAN drives. Centralise the concept of the default drive number, since it is shared between all supported environments. Signed-off-by: Michael Brown <mcb30@ipxe.org>