" One feature that pretty much amazed me was that the 106s supports UDMA66 standards. Not exactly a really big thing, especially since harddrives support at least up to ATA100 and some ATA133. This is good in the sense that if you have to hook up the 106s on the same IDE channel as your harddrives, you won't lose a significant amount of performance. This is because the motherboard will run IDE devices on the same channel at the lowest maximum transfer mode of both devices. "
FULL STORY @ 8BALLSHARDWARE (http://www.8ballshardware.com/articles/pioneer106s/page1.cfm)