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BD-R stands for Blu-ray Disc Recordable. It is a write-once form of blank media offered by the Blu-ray Disc Association. As of February, 2007, BD-R discs can be found with a capacity of 25GB (single layer) and commercially available burners have a maximum write speed of 4x. The Re-writable form of Blu-ray Recordable Media is BD-RE.