Welcome to cdfreaks
Sorry you haven't received a reply yet. I'll try to help
1/ What disc did you have in the drive when you ran Nero Infotool? Nero reports the speed it can read the current inserted disc at.
2/ Your drive can only read single layer pressed discs at 12x. Dual layer disc and burnable media will read at less than this, probably 8x.
3/ Use Nero CD-DVD speed to do a transfer rate test on your discs, to see what speed it will read them at.
Hope this helps
Moved to the Sony/Liteon forum