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BD9 is a red laser DVD with BD contents on it. This disc should be rotated at 3x speed or more to satisfy the minimum transfer rate of 30.24 Mbit/s.

These disks can be used for private storing and can be authored even without implementing AACS. BD9 was originally proposed by Warner Home Vidéo, as a cost-effective alternative to regular Blu-ray discs. It is similar to HD DVD's 3x DVD