oh yes, i am very familiar with the workings of the drive, as I have been fixing quite a few of my friends systems. this seems to be a common problem. I was hoping someone who was tech savvier than I. I have tried this on two separate assemblies and met with the same result. I think it has something to do with the calibration of the assembly, but I have found no way of modifying this.
I am quite familiar with the drive assembly, all of it works properly, I found a few links that says it has to do with a the calibration of the laser.
A lot of info, non that helped me, but I am posting them for the benefit of any other techy's out there who are working on the same or similar problem.