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22-Dec-2017 07:11

These discs also use a higher numerical aperture than DVDs, 0.85 compared to 0.6 for DVD (whereas HD DVD uses only 0.65).Blu-ray's rivals are skeptical that the higher numerical aperture will lead to reliability issues with BD-ROM discs.

However, it was thought that HD DVD would then have a huge advantage over Blu-ray as HD DVD discs can be handled like DVDs and CDs, which are familiar to consumers.

The codecs that will be used for video on BD-ROM discs are MPEG-2, MPEG-4 H.264/AVC Codec and VC-1.