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You can't really compare a Blu-Ray drive to a DVD drive. With a DVD, the transfer rate varies fast or slow depending on where you are reading/writing on the disc. A Blu-Ray drive, on the other hand, maintains the same transfer rate wherever you are on the disc. But yes, redundancy is a technique developers use to increase load times. A game like Shenmue 2 on the Xbox1, for example, came on dual layer DVD, but, if the redundant files were crosslinked, could be made to fit on a single layer DVD. The other technique PS3 developers can use to decrease load times, and which was used in some Xbox1 games but can no longer be used in Xbox360 games, is hard disk caching. Oblivion for the PS3 does this. The Core system ruined this for the 360.