The downside is that this feels like it's coming at the cost of 4K UHD Blu-rays. Quiz 8 Questions · Test Your Knowledge UHD Blu-ray technologyTrivia challenge 4K discs, Dolby Vision, and beyond — how much do you really know about UHD Blu-ray? 4K Video Audio Hardware Formats Standards Begin 01 / 8 Standards What is the maximum video resolution supported by the UHD Blu-ray format? UHD Blu-ray supports a maximum resolution of 3840 x 2160, commonly known as 4K UHD. Maybe things can change for the better, but I'll just continue to be picky with my Disney 4K releases in the meantime.