What are the differences between DVD, Blu-ray and Ultra HD Blu-ray formats?

DVDs offer 4.7Gb of storage, whereas Blu-ray and Ultra HD Blu-ray increases this capacity by five to 20 times – allowing discs to store the higher volumes of data needed to support Full HD and Ultra HD viewing. This is due to the blue laser and improved lens specifications, allowing for a much smaller focus laser beam which enables the recording of much smaller and higher density pits on the discs.

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