This isn't going to answer your question but it will solve your problems... take it from someone with experience... just ditch that drive. Philips produces among the worst optical drives period. Even for simple tasks, they are unreliable at best. The best firmware for that drive is at the bottom of a landfill.
With quality optical drives being as affordable as they are, there is really no excuse not to get a newer unit.
Get yourself a LiteOn, Plextor or other quality drive. Just do some reading on the forums here and you'll get an idea of what the better drives are. Then you can quit having as many headaches and enjoy life again.