Will it get to maximum performance with USB 2.0? Four pin firewire?
I tested my 5163D on my Acer Travelmate 801. Using USB 2.0, I got a burst speed of 24 MB/sec, using firewire it went up to 29 MB/sec. Both should be enough for 16x burning. Of course your HDD has to be quick enough to supply data at that speed.