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Video:What Is Blu-Ray?

with Tom Knight

Blu-Ray, the world standard high-definition video disc, has huge storage capacities which means you get brilliant audio and video quality. Get all the information about this amazing technology in this gadgets video from About.com.See Transcript

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Transcript:What Is Blu-Ray?

Hi! This is Tom Knight for About.com. Today, we're here to talk about what is Blu-Ray.

What is Blu-Ray?

Blu-Ray is the high-definition video disc standard in the world. It beat out HD-DVD in 2008. Basically, it's a high-capacity disc-based format. It's the same physical size as a DVD, but it holds a lot more information.

How is a Blu-Ray Different than a DVD?

A Blu-Ray uses a blue laser instead of a red laser. A blue laser has a much narrower beam than a red laser. On a disc, data is stored in pits. If you have smaller pits, then you can fit more data. The Blu-Ray laser is narrow enough to read those tiny pits. DVDs can hold 4.7 gigabytes per layer, compared to Blu-Rays, which can hold 25 gigabytes per layer. Dual layer Blu-Rays are now available, and theoretically, there can be even more layers.

How Much Capacity Do Blu-Ray Discs Have?

Blu-Rays can support high resolution of up to 1080p progressive, which means that you're going to see a much clearer picture than anything else commercially available. It also allows you to store HD content in 3D. There is so much more storage on a Blu-Ray that it allows for much greater audio fidelity. You can have up to 8 tracks of uncompressed audio on a Blu-Ray. Dolby Digital, DTS, and Uncompressed PCM are standard on Blu-Ray.

Recordable Blu-Rays, known as BD-Rs or BD-RE erasable discs, are widely available, and they're mostly used for data storage in computer systems. Blu-Ray players are made by most major electronics manufacturers. Sony, which originated the format, uses the format in its Playstation 3.

Blu-Ray and Downloadable and Streamed Content

Blu-Rays may the last major disc format since downloadable and streamed content is taking over the media. But Blu-Ray is still increasing in popularity, probably because it has the highest quality audio and video of any option available today.

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