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Blu-ray Disc authoring; Blu-ray Disc; Blu-ray Disc Association; Blu-ray Disc recordable; Blu-ray Region Code; CBHD Based on HD DVD format. Comparison of high definition optical disc formats; Digital rights management; HD DVD; HD NVD; High definition optical disc format war; Optical disc; PlayStation 3
In spite of having the "Blu-ray" brand, "BDXL" (or "BD-XL") is separate from the original "BD" format, meaning existing Blu-ray drives that predate the release of BDXL (mid-2010) do not support BDXL. Even Blu-ray drives released after that date may not necessarily support BDXL unless explicitly stated. [9]
DVD lens supports a different focus for CD or DVD media with same laser. With the newer Blu-ray Disc drives, the laser only has to penetrate 0.1 mm of material. Thus the optical assembly would normally have to have an even greater focus range. In practice, the Blu-ray optical system is separate from the DVD/CD system.
In 2009, Panasonic introduced the world's first Blu-ray disc recorder which was capable of recording both DVDs and Blu-ray discs and featured built in satellite HDTV tuners. A year later, Panasonic introduced Blu-ray disc recorders with terrestrial HDTV tuners. DVD recorders have technical advantages over VCRs, including: [citation needed]
[3] Comparing it to the mid-range UB820 and the entry-level UB154, TechRadar said UB9000 has the best picture quality and the most effective upscaling of the three. [8] They also named it the best premium 4K Blu-ray player. [9] TechHive praised the image and build quality but called the out-of-the box audio playback "overly clinical". [10]
For Blu-ray discs, 1× speed is defined as 36 megabits per second (Mbit/s), which is equal to 4.5 megabytes per second (MB/s). [7] However, as the minimum required data transfer rate for Blu-ray movie discs is 54 Mbit/s, the minimum speed for a Blu-ray drive intended for commercial movie playback should be 2×. The fastest Blu-ray speed is 16×.