So... - 40x 700mb CD-R pack review

I bought these CDs so I could record things on them. They were pretty cheap, but the CDs worked fine and the casing was strong enough not to get scratched in a full backpack. It was quite easy to burn music on the CD. No problems there, but after a while, whenever I put a CD in, there would be a problem. It would say there is not enough memory or it was already written on, but that didn't make sense. It was a new CD. So how does that work? Only a handlful of CDs worked, but the other bigger handful couldn't be recorded on. What a waste. I wonder if this is a way to get money for the companies? It could be a manufactoring glitch, but that is a lot of errors in one pack. I'm disappointed in these CDs and I'll probably use different CDs next time. I would suggest that you do that same, as well. This is not worth the money you spend on it. I guess this is one case in which if you don't pay more, you wn't get the quality you're seeking.