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R4 Format Specification

This version was defined in December 2017 and is a multi-layered recordable in BDAV with the speed of 2X and 4X, capable of 100/128GB and usage of UDF2.5/2.6 as file system and with Ultra HD broadcast recording as a new feature.

Current Format Books

System Description Blu-ray Disc Recordable  Part 1: Basic Format Specifications Ver.1.40 November 2017 Part 1: Basic Format Specifications Ver. 2.20 November 2017  System Description Blu-ray Disc Recordable Part 2: File System Specifications Ver. 3.0 November 2017 System Description Blu-ray Disc Rewritable Part 3: Audio Visual Basic Specifications Ver.5.1 December 2018