are blu ray movies backward compatible
It's expected that Ultra HD Blu-ray will upgrade the format to handle 33GB layers (up from the 25GB per layer of current discs) and discs that hold as much 100GB of data. You'll need a new player to read the new discs, but the new players will be backwards compatible with existing Blu-ray movies. In our discussions with studio execs, we've heard that most movies encoded with HEVC (h.265, the new compression format for 4K video) should fit on dual-layer discs comfortably.