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Chark said:
Well I'd assume installs are the approach, but maybe that secondary CPU and ability to play while things are downloading will work even with physical disks. It should be far and wide better. Sony will put a drive fast enough to run 4K blu ray movies. Anyone know what kind of disks speeds that would require? Sony could always change the drive before launch.

Just a few minor obstacles: There are no drives that can play 4k movies. There are no blu-ray disks that can hold a 4k movie. There aren't any specs about how 4k movies actually should be played.