ok Sony CD-R's and you have
Nero. In Nero you have Tools and one of them is CD -DVD Speed. Throw one of them in and open up that tool and click on the Disc Info Tab. Post what is says.
Now that you actually burned the finished CD-R master with your PC......what brand/model is that one? and what speed did you burn it?
Overburning is when say you have an 80 minute CD-R and you put 82 minutes on it.