Page 1 of 2: Blu-ray Disc

aujla · Credits: 102267513 My Scrapbook

Blu-ray Disc

A Blu-ray Disc (also called BD) is a high-density optical disc format for the storage of digital media, including high-definition video.

Media type: High-density optical disc
Encoding: MPEG-2, H.264, and VC-1
Capacity: 25 GB (single layer), 50 GB (dual layer)
Read mechanism: [email address in profile] 36 Mbit/s & [email address in profile] 72 Mbit/s
Developed by: Blu-ray Disc Association
Usage: Data storage, high-definition video and PlayStation 3 Games

The name Blu-ray Disc is derived from the blue-violet laser used to read and write this type of disc. Because of its shorter wavelength (405 nm), substantially more data can be stored on a Blu-ray Disc than on the DVD format, which uses a red, 650 nm laser. A single layer Blu-ray Disc can store 25 GB, over 5 times the size of a single layer DVD at 4.7 GB. A dual layer Blu-ray Disc can store 50 GB, almost 6 times the size of a dual layer DVD at 8.5 GB.

Blu-ray Disc is similar to PDD, another optical disc format developed by Sony (which has been available since 2004) but offering higher data transfer speeds. PDD was not intended for home video use and was aimed at business data archiving and backup.

About 9 hours of high-definition (HD) video can be stored on a 50 GB disc.
About 23 hours of standard-definition (SD) video can be stored on a 50 GB disc.
On average, a single-layer disc can hold a High Definition feature of 135 minutes using MPEG-2, with additional room for 2 hours of bonus material in standard definition quality. A dual layer disc will extend this number up to 3 hours in HD quality and 9 hours of SD bonus material.

Laser and optics
The Blu-ray Disc system uses a blue-violet laser operating at a wavelength of 405 nm, similar to the one used for HD DVD, to read and write data. Conventional DVDs and CDs use red and infrared lasers at 650 nm and 780 nm respectively

Hard-coating technology
Because the Blu-ray Disc standard places the data recording layer close to the surface of the disc, early discs were susceptible to contamination and scratches and had to be enclosed in plastic caddies for protection. The consortium worried that such an inconvenience would hurt Blu-ray Disc's market adoption. Blu-ray Discs now use a layer of protective material on the surface through which the data is read.

The recent introduction of a clear polymer coating has given Blu-ray Discs substantial scratch resistance. The coating is developed by TDK and is called "Durabis". It allows BDs to be cleaned safely with only a tissue. The coating is said to successfully resist "wire wool scrubbing" according to Samsung Optical technical manager Chas Kalsi. It is not clear, however, whether discs will use the Durabis coating as a standard or only in premium discs.

Both Sony and Panasonic replication methods include proprietary hard-coat technologies. Sony's rewritable media are sprayed with a scratch-resistant and antistatic coating. Verbatim recordable and rewritable Blu-ray Disc discs use their own proprietary hard-coat technology called ScratchGuard.

aujla · Credits: 102267513 My Scrapbook

aujla · Credits: 102267513 My Scrapbook

aujla · Credits: 102267513 My Scrapbook

Enjoy the blue ray technology

aujla · Credits: 102267513 My Scrapbook

its expensive rite now but will be cheap soon maybe year or two

borntowin · Credits: 21396 My Scrapbook My Reading List 8 Books

hey aujla,

nice technology yaar..thanks for the info

yup...its expensive now especially for us when we aren't into practice...hehe
seems will have to wait for sometime

BGM · Credits: 104350 My Scrapbook

Cool! Soon we may see small memory flash cards with 25 terabyte space

borntowin · Credits: 21396 My Scrapbook My Reading List 8 Books

aujla · Credits: 102267513 My Scrapbook

i cant imagine what will happen in next 50 years

kary · Credits: 9316 My Scrapbook My Reading List 8 Books

Hi it would be good if you could mention here the rival technology called HD DVD used by toshiba and others so everyone gets to know the difference between the two and which is the better option.

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