CDex slow on one drive only - plz help!

Can anyone help? CDex is taking about three times as long to rip to mp3 when I use my toshiba 1712 drive with j004 f/w. When I use my Pioneer 106 its much quicker. Nero drivespeed seems to think the 2 drives speeds are more or less the same speed wise. I also noticed some tracks that produce errors on my Toshiba dont in my 106.

Is the drive broken or is it some sort of CDex issue? Any help much appreciated!