In future, I will be using Blu-ray Disc. Blu-ray Disc (BD official abbreviation) is an optical disc storage format designed to replace DVD. format defined as their physical environment Standard 12 cm (same as DVD and CD), 25 GB disc by optical layer, dual-layer discs (50 GB) in video disc standard-length films and coatings late as possible.
Name Blu-ray Disc refers to blue laser to read disk, which allows six times more storage on the DVD. Blu term was used instead of correct blue is commonly used in English (and therefore not registrable as the trademark).