Bitfields for Extended Absolute Disk Read/Write mode flags:
Bit(s)	Description	)
 0	direction (0=read, 1=write)
 12-1	reserved (0)
 14-13	write type (should be 00 on reads)
	00 unknown data
	01 FAT data
	10 directory data
	11 file data
 15	reserved (0)