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Ultra HD Blu-ray (4K Ultra HD, UHD-BD, or 4K Blu-ray) [2] [3] is a digital optical disc data storage format that is an enhanced variant of Blu-ray. [4] Ultra HD Blu-ray supports 4K UHD (3840 × 2160 pixel resolution) video at frame rates up to 60 progressive frames per second, [4] encoded using High-Efficiency Video Coding. [4]
Comparison of the high-definition optical media formats DVD included for comparison Mandatory codecs must be supported by the player. Each disc must use one or more of the mandatory codecs. Ultra HD Blu-ray Blu-ray Disc HD DVD CBHD AVCHD AVCREC DVD; Laser wavelength: 405 nm (blue-violet laser) 405 or 650 nm 650 nm (red laser) Numerical aperture ...
Unlike early CD-ROM drives, optical disc recorder drives have generally used industry standard connection protocols. Early computer-based CD recorders were generally connected by way of SCSI ; however, as SCSI was abandoned by its most significant users (particularly Apple Computer ), it became an expensive option for most computer users.
Optical drives for computers come in two main form factors: half-height (also known as desktop drive) and slim type (used in laptop computers and compact desktop computers). They exist as both internal and external variants. Half-height optical drives are around 4 centimetres tall, while slim type optical drives are around 1 cm tall.
However, not all optical drives provide this capability, and support for this feature can vary significantly between manufacturers and drive models. On drives lacking raw data access, users may rely on a less precise method: monitoring unexpected reductions in read speed, though this is a far less reliable indicator of disc health.
Ultra HD Blu-ray disc playback: PowerDVD 17 is the first software that supports 4K UHD Blu-ray drives, however this feature only worked on PCs with Intel's Software Guard Extensions (SGX). In January 2022, Intel deprecated support for SGX for the Rocket Lake and Alder Lake generation desktop processors, leading to Ultra HD Blu-ray discs being ...