The large NA value effectively means that Blu-ray will require less recording power and lower disc rotation speed than DVD and HD-DVD to achieve the same data transfer rate.
How fast can you read/write data on a Blu-ray disc? Blu-ray also has the potential for much higher speeds, as a result of the larger numerical aperture (NA) adopted by Blu-ray Disc.
Plus many can access online content, including streaming services. The format offers more than five times the storage capacity of traditional DVDs and can hold up to 25GB on a single-layer disc and 50GB on a dual-layer disc. The format was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data.SMPTE VC-1 - standard based on Microsoft's Windows Media Video (WMV) technology.Please note that this simply means that all Blu-ray players and recorders will have to support playback of these video codecs, it will still be up to the movie studios to decide which video codec(s) they use for their releases.Blu-ray also adopts a new error correction system which is more robust and efficient than the one used for DVDs.