Blu-ray Disc recordable BD RW RE
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Blu-ray Disc recordable refers to two optical disc formats that can be recorded with an optical disc recorder. BD-R discs can be written to once, whereas BD-RW can be erased and re-recorded multiple times. Disc capacities are 25GB (23.31 GiB) for single layer discs and 50GB (46.61 GiB) for double layer discs.
As of January 2008, recordable Blu-ray BD-R/RE drives up to 6x are sold for about US$400 and 2x single-layer BD-R discs with a capacity of 25 GB can be found for US$10. The theoretical maximum for Blu-ray Discs is about 12x, as the speed of rotation (10,000 rpm) causes too much wobble for the discs to be read properly. This is similar to the 20x and 52x respective maximum speeds of DVDs and CDs.