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My guess is that it has nothing to do with good or bad disc, but rather sales. People buy Rocs like they're candy, not because the disc is a good disc, it's not. It can be made into a good disc but it isn't off the shelf. There are better discs off the shelf. Sooooo, if you're talking about replacing a disc because it's not a good disc and there are better discs available, the Roc seems a better candidate than the Cobra.