Blu-ray is the next-generation optical disc format. It has been developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data. A...

Blu-ray is the next-generation optical disc format. It has been developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data. A single-layer Blu-ray disc can hold 25GB, which can be used to record over 2 hours of HDTV or more than 13 hours of standard-definition TV. There are also dual-layer versions that can hold up to 50GB of data. They're blue and the pre-recorded discs are see through – different from our standard opaque media discs.

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