my pioneer 115D v1.18 is connected as described by bjkg. my transfer mode is UDMA 4.
firmware doesn't control your DMA,
this is not always true. BenQ 1640 firmware is UDMA 2 while BenQ 164B firmware is UDMA 4. my internal BenQ 1640 is currently flashed using external BenQ 164B BEFB firmware. i choose to use this firmware because i use the drive only for ripping and quality scans, burn with either Pioneer 115D or Optiarc 7201A