> I've got a DRU500A.

I know it is a little late, but I have to personally dis-recommend the Sony DRU-500 burners. I had a dru500a as well, and it died a couple of months after I got it. There is also a problem with that drive burning at the top speed; many people (including me) have been completely unable to burn at 4x. Sony is aware of the problem but refuses to take any blame for it. I got a Lite-on to replace it and it works much better.