Blu-ray Disc (also known as Blu-ray or BD) is an optical disc storage medium. Its main uses are high-definition video and data storage. The disc has the same physical dimensions as standard DVDs and CDs.Just as DVD meant a five to 10 times increase in storage capacity compared to CD,
Blu-ray Disc represents an increase over DVD capacity by five to 10 times.
This is due, among other reasons, to the usage of a blue instead of a red
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 disc.
Due to the fact that the data layer on a Blu-ray Disc is placed much “closer”
to the laser lens than in DVD, there is less distortion resulting in
significantly improved tolerances. Hence, more precision and ultra-high storage
densities are now possible.
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