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What’s Behind the Technology of Blu-Ray And HD DVD
Movies are finally ready to take advantage of the high definition screens that have been in stores for years. DVDs have brought us great picture and sound which has created a boom in the television and home theater market. Display technology has rapidly developed to give us a picture that is twice as good as DVD-quality video. The problem was that DVDs couldn’t store enough information to accommodate HD quality video and sound, until now. New technology has created a DVD that can store up to five times more information than before. This new technology comes in two formats called Blu-Ray and HD DVD. These two formats were created separately and currently compete with each other. They both use similar technology to bring HD quality video and sound, but they have some differences.
The technology behind both formats is based on the same optical technique that regular DVDs use. A laser is focused on the surface of the disc and reads the digital information which is converted into video and sound. Blu-Ray and HD DVD incorporate a new colored laser that can be focused more precisely on a smaller area of the disc. This allows to have more information on the same size disk. It’s like a record player using a smaller needle and the lines are just pushed closer together towards the center, leaving more room outside for more information. The reason the information needs to fit on a disc the same size as a DVD is that all optical discs created with older technologies fit in the same drive. So a Blu-Ray or HD DVD player will read CDs, DVDs and their own discs. Due to their competition, no player plays Blu-Ray and HD DVD.
The main difference between the two formats is simply a matter of storage. HD DVDs can store 15 GB; about three times more than a DVD. A Blu-Ray disc can store 25 GB, about five times more than a DVD. Both will have the same video resolution from now on, but Blu-Ray has the potential to store better video when available. For now, the extra space is used for movie extras like behind-the-scenes segments. Only time will tell if these formats will merge or compete to the bitter end. History has shown us that one format usually prevails.
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