Since 2006, Blu-ray has been the latest in disc technology. It was developed with the goal of recording, rewriting and playing high definition video, as well as offering more storage space. Blu-rays are different than DVDs because instead of reading and writing data with red-laser technology, Blu-ray uses blue-violet laser technology. In the battle between Blu-ray and DVD, technological and entertainment experts agree that Blu-ray is the clear winner.
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Blue-Violet Versus Red Laser
A shorter wavelength is what makes the blue-violet laser used to record data on Blu-ray discs better than the red laser used on DVDs. The shorter wavelength allows the laser to focus more precisely, making it possible to record more information in a smaller space.
With up to 50GB of storage space on a dual-layer disc, Blu-rays have five times the storage capacity of a DVD. One Blu-ray disc is able to record nine hours of high definition video and a whopping 23 hours of standard video. This allows room for movies to add more special features like deleted scenes, audio commentary, and documentary style shorts about the making of the film. Another advantage of this amount of storage capacity is that a Blu-ray disc will be able to support the next level of technology: 3-D content. Due to the overwhelming success of 3-D movies in theatres, the makers of Blu-ray discs have begun developing the same technology on a smaller level, so that consumers can have the 3-D experience in their own homes.
Backwards compatibility means that DVDs, CDs and Blu-rays can be played on Blu-ray players. This gives Blu-ray an advantage because people who purchase a Blu-ray player have the ability to use multiple technologies.
Audio and Picture Quality
Blu-ray players offer the best-quality sound and picture for home theatre systems. While the DVD and Blu-ray are both compatible with Dolby True HD and DTS Master Audio, the way the discs are encoded makes the sound quality on a Blu-ray disc better than DVD. Likewise, though DVD typically produces 480 horizontal lines of resolution, Blu-ray more than doubles that, producing 1080 horizontal lines of resolution.
While Blu-ray discs started out costing significantly more than their DVD counterparts, it is predicted by the Blu-ray Disc Association that this won't be true for long. Due to the low production cost of Blu-ray technology, the price will continue to lower as more and more consumers purchase the product. The cost is expected to first become comparable to DVDs, then dip even lower in cost in an effort to render DVDs obsolete.
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