Blu-ray recordable disc

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,^[1] 100 GB for triple layer and 128 GB for quadruple layer (in BD-R only).^[2] The Blu-ray Disc specification defines 1× speed as 36 megabits (4.5 megabytes) per second

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).^[4][5][6][7]

BD-RE versions

Version 1.0—RE 1.0

• defined in 2002
• unique BD File System (BDFS)
• not computer compatible
• BDAV (Blu-ray Disc Audio/Visual) application format^[8]
• BDCP as content protection^[9][10]

Version 2.0—RE 2.0

• defined in 2005
• UDF 2.5 file system for computer use
• the use of AACS^[11]
• added Hybrid Format—defined for combined discs of BD/CD or BD/DVD. However, BD recording media (BD-RE and BD-R) are inapplicable. This book is attached to "Part 1 Basic Format Specifications" of every format, except BD-RE Version 1.^[12]
• BD-R Version 1.0 follows this specification^[13]

Version 3.0—RE 3.0

• defined in September 2006
• camcorder (8 cm) discs added—camcorder is added as one of BD product categories
• backward compatible with Version 2.0
• added BDMV (Blu-ray Disc Movie) application format^[4][14]
• BD-R Version 2.0 follows this specification

Version 4.0—RE 4.0—(BDXL)

• defined in June 2010
• a multi-layered rewritable in BDAV with the speed of 2× and 4×
• capable of 100 GB and usage of UDF 2.5 as file system and Professional Device is a newly added as one of BD product categories^[15]

BD-R versions

Version 1.0—R 1.0

• defined in 2005
• UDF 2.5 file system for computer use
• the use of AACS
• BD-R Version 1 Part 3 is the same book as BD-RE Version 2 Part 3^[16]
• add BD-R Low To High (BD-R LTH) standard.^[17]

Version 2.0—R 2.0

• defined in September 2006
• camcorder (8 cm) discs added—camcorder is added as one of BD product categories
• backward compatible with Version 1
• added BDMV (Blu-ray Disc Movie) application format
• BD-R Version 2 Part 3 is the same book as BD-RE Version 3 Part 3^[4]

Version 3.0—R 3.0 (BDXL)

• defined in June 2010
• a multi-layered recordable in BDAV with 2× and 4× speeds
• capable of 100/128 GB and usage of UDF 2.5/2.6 as file system and Professional Device is a newly added as one of BD product categoBlu-ray recordable disc