Try comparing the rip speed using EAC (Exact Audio Copy) instead of WMP. WMP isn't a fair comparison since it doesn't do proper error checking/correction. Comparing against EAC is a more fair comparison.
Alright. EAC in Secure Mode = 1.7x, same as MC15 in Secure Mode. EAC in Burst Mode = 25x. Now why can't MC in normal mode do that? As stated in my original post, with Secure Mode turned off, MC still only produces about 3x. Although Windows Media Player doesn't display the speed as it rips, it seems like it rips tracks just about as quickly as EAC in Burst Mode.
What are the specs of the machine you're using? I'm just wondering if it isn't another case of the bad AMD SB drivers rearing it's ugly head.
AMD Phenom II X2 555 Black Edition 3.2GHz
Asus M4A88T-EVO/USB3 motherboard
4GB RAM
WD Caviar Blue 160GB system drive
Seagate Barracuda 1TB documents drive
LG DVD burner Model GH24LS50
I hope to have time tonight or tomorrow to open up my system and throw in an extra drive I have lying around to see if it is, in fact, the drive.