Question: are 4k uhd discs blu ray?
Answer: Ultra HD Blu-ray (marketed as 4K Ultra HD) (UHD-BD) is a digital optical disc data storage format that is an enhanced variant of Blu-ray. ... Ultra HD Blu-ray supports 4K UHD (3840 × 2160 pixel resolution) video at frame rates up to 60 progressive frames per second, encoded using High Efficiency Video Coding.