Odd burner problem

I have a NEC burner (sorry don’t have the model # handy), that has stopped reading blank CD media. It reads blank DVDs just fine, but any time I put a CD in the drive it just spins and spins and eventually it is spit out and Nero (or whatever program I am using at the time) asks for a blank CD.

Is this possible? Wouldn’t the same optics read both discs? Why would it read one and not the other? I’ve used different burining software and different blank media, so I’m pretty sure it’s the drive.

Any input would be appreciated.