Fortunately, that's an easy question.
Cross-flash the BenQ to the "L" version of the external firmware.
Use the .cvt file and the windows based flasher utility.
Now, it is at ATA66, just like the Lite-On is an ATA66, and this may convince your drive controller to enable ATA66/UDMA mode 4.
Update the BenQ to the latest external firmware after removing the rip-lock from the firmware with mediacodespeededit.
If it doesn't work, use a recommended external case for the BenQ. All better!
If this still doesn't work (and that is SO unlikely), cross flash it back, using "T9" in the .cvt file format.
- In fact, using the external enclosures, you may be able to get rid of the controller card that is causing you so much trouble.
*Drives go together in "families" with the technology leader as the master drive. For a factory BenQ at UDMA33 and a factory Lite-On, the Lite-On at ATA66 is the master.
But, there's a catch/trick.
*The "33" speeds are misleading. Here's a short bit:
ATA33 (like the Sony 52x CDRW) and lower drives work on a 40 wire cable and the master goes at center point.
UDMA33/UDMA2 (BenQ), ATA44-48/UDMA3, ATA66/UDMA4 (Lite-On), ATA100/UDMA5, and ATA133/UDMA6 work on an 80 wire cable and the master (higher numbers) goes at the end point.
Due to master positions on the cable, these two differing families of technology may not share any cable. Otherwise there will be either two masters or two slaves, which is a non-working configuration.
With any hardware change involving cable type or drive "family" then it is necessary to clear the CMOS or blank the controller memory. Otherwise the controller will be stuck onto the previous configuration that does not work with the new hardware change.
*Multi-Word DMA 2, which is ATA33, will not affect read speeds of optical drives. However, it will cause decreased quality of writing when mistakenly used to control UDMA33/UDMA2 and higher spec drives.
*If you experience 8x or lower speeds (as you described), then your drive is actually using basic, slow PIO mode. In your case, Windows is trying to fix it by engaging software-based DMA.
An external case will offer better performance. One of the firewire plus USB models is recommended because you need the USB to flash and the firewire connection offers best performance.