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Blu-ray Disc Recordable refers to two direct to disc optical disc recording technologies that can be recorded on to a Blu-ray-based optical disc with an optical disc recorder. BD-R discs can be written to once, whereas Blu-ray Disc Recordable Erasable can be erased and re-recorded multiple times. Disc capacities are 25 GB for single-layer discs, 50 GB for double-layer discs, 100 GB for triple-layer, and 128 GB for quadruple-layer.
The minimum speed at which a Blu-ray Disc can be written is 36 megabits per second.
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