Sorry I wasn't clear. I personally think it's not the reverse ATA or something else with the drive, but the combination of the particular drive and your laptop. Of course I only have experiences with 6750 and my Dell B130, so take it with a grain of salt. But the sympton is the same (cannot read commercially-pressed CD/DVDs, but reads CD-R/DVD+-R ok). At the end of it, a couple of us having the same problem all got some other drives that work (mine is NEC ND-6500, others got Pioneer K16 or something, check the other thread).
I am just pointing out some other similar experiences and our solutions, but no, we didn't solve the problem with 6750. Good luck! (I still have the 6750, so I'd be tracking the thread if someone actually solve the mystry.