Not sure about limits. Though there's a holograhic disc in development with 1,024 GC capacity, (1 Terabyte). Then some way in the future there's a disc using nano technology with 100,000 TB or more. Still, I would suggest a 1TB discs would easily be sufficient for hi-def resolutions of 1920/1080p.
As for a single format, I think it makes sense. Why do we need cd, dvd, dvdA, SACD. Why can't we have the one disc that plays music, video etc? :?:
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