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Blu-ray Disc recordable
Blu-ray Disc Recordable (or BD-R) refers to two direct to disc optical disc recording technologies that can be recorded on to an optical disc with an optical disc recorder. BD-R discs can be written to once, whereas BD-RE (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,〔(【引用サイトリンク】 Blu-ray FAQ: How much data can you fit on a Blu-ray disc? )〕 100 GB for triple-layer, and 128 GB for quadruple-layer (in BD-R only).〔(【引用サイトリンク】 BDA approves BDXL quad-layer Blu-ray standard )〕
The minimum speed at which a Blu-ray Disc can be written is 36 megabits (4.5 megabytes) per second.〔(【引用サイトリンク】 Blu-ray FAQ: How fast can you read/write data on a Blu-ray disc? )〕
==Version==
There are four versions of Blu-ray Disc Recordable Erasable (BD-RE) and three versions of Blu-ray Disc Recordable (BD-R). Each version includes three ''Parts'' (a.k.a. ''Books''): Basic Format Specifications, File System Specifications, Audio Visual Basic Specifications. Each part has sub-versions (e.g. R2 Format Specification includes ''Part 3: Audio Visual Basic Specifications Ver.3.02'', ''Part 2: File System Specifications Ver. 1.11'', ''Part 1: Basic Format Specifications Ver. 1.3'').〔(【引用サイトリンク】title=R2 Format Specification )〕〔(【引用サイトリンク】title=Blu-ray – All Books, As of December 2009 )〕〔(【引用サイトリンク】title=Blu-ray – All Books, As of June 2010 )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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