This question is for the Pioneer 16x DVD ROM drive.
It appears that there are two versions of this drive, DVD-116 and DVD-115. Pioneer only advertises the DVD-116 but resellers have listed both drives. According to a store, the DVD-115 is UDMA 33 and has a transfer rate of 33MBps. The same store claims that the DVD-116 is UDMA 66 but it's transfer rate is also 33MBps.
Is there a speed difference between:
DVD-116 UDMA 66 @ 33MBps
DVD-115 UDMA 33 @ 33MBps
The DVD-116 is more expensive.
Check the specs of the drives here: