Blu-ray Disc (BD) is a new format for an optical disc storage. The dimension is just like standard DVD or CD. And the main uses are for high-difinition video (HDTV) and data storage.

And the name blue-ray is came from the Blue-violet laser used to write and read this type of disc. Compare to standard DVD format, which uses a red laser, a dual layer Blu-ray Disc can store up tu 50 GB.

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