Why was this new DVD format developed?

Blu-ray is also commonly known as Blu-ray Disc (BD) and is a type of optical disc media, as is the CD and regular DVD. This new format was created to allow recording and playback of “HD” (high definition) content as well as the ability to store large amounts of data.

How much data can a Blu-ray disc hold?

This new format offers as much as five times more storage capacity that traditional DVDs… a single layer Blu-ray disc has a 25gb capacity, and a dual layer Blu-ray has a 50gb capacity.

This means approximately nine hours of high-definition (HD) video and 23 hours of standard-definition (SD) video can be accommodated on a 50gb disc.

Where does the name come from?

The Blu-ray name comes from the colour of the laser used to read and write data on the disc… it’s a blue/violet colour. The word “Ray” is short for “Optical Ray” which describes what type of laser is used. The misspelling of the word “Blu” is not a mistake, according to the Blu-ray Disc Association, as the letter “e” was intentionally removed so the name could be trademark registered.

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