Here's my opinion on the problem now:
1. I think that since MS is still developing this software, that they probably have not added a full list of drivers for all devices and modes of drives.
2. I think that a single drive can actually use several drivers, depending on the settings of the drive and motherboard.
3. My drive is about 1 year old, so should work. However, I will need to tinker around with it's settings and the way in which the motherboard uses the drive, in order to trigger a different driver that is supported by RC.
4. The comment that switching from DVD-R to DVD+R supports this theory. The comment about changing settings on a drive from 1.5GB to 3.0GB also supports this theory.
5. I'll try these out systematically, when I get some free time to mess with it.