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What Is Bluray?

In the 1980s the CD was first introduced to the world, and represented a big jump from old tapes. There was a big enhancement in audio quality, and its 650 MB storage capacity was also a big jump in data storage. The CD was ideal for audio and some data applications, but in the 1990s came demand for a new product offering bigger storage. These needs pushed the development of the DVD and the 10 x increase in capacity. This enabled a high quality video distribution and recording facility. The DVD also offered backwards compatibility so old CDs were not obsolete. Today the advent of HD TV and video requires a new answer. The new answer has arrived in the form of Blu-ray Disc, the only format offering such a dramatic increase in storage capacity with its 25 to 50 GB discs. This made possible the sharing and recording of HD video.

Blue Ray Logo

What is Blu-ray Disc?
Following the long war between Sony and Toshiba for the new generation of optical disc format.Sony’s Blu-ray Disc won the race in February 2008. Blu-Ray Disc enables the ultimate HD experience. 

The name Blu-ray comes from the Blu-ray laser beam which reads and writes the data from the new Blu-ray discs. The laser beam is blue instead of red. The blue laser is at the heart of Blu-ray technology. The name comes from Blue as in the laser colour, and Ray as in optical ray.

Blu-ray and DVD capacity

The Blu-ray format was created to enable Blu-ray recording, Blu-ray rewriting and Blu-ray playback of HD video, and data storage. Blu-ray discs offer more storage capacity than DVDs and can hold up to 25GB on a single-layer Blu-ray disc and 50GB on a dual-layer Blu-ray disc. 

Blu-ray is the next-generation digital video disc. It can record, store and play back high-definition video and digital audio, as well as computer data. The advantage to Blu-ray is the sheer amount of information it can hold:
  • A single-layer Blu-ray disc, which is roughly the same size as a DVD, can hold up to 27 GB of data -- that's more than two hours of high-definition video or about 13 hours of standard video.
  • A double-layer Blu-ray disc can store up to 50 GB, enough to hold about 4.5 hours of high-definition video or more than 20 hours of standard video. And there are even plans in the works to develop a disc with twice that amount of storage.
How Blu-ray Reads Data ?

The Blu-ray disc overcomes DVD-reading issues by placing the data on top of a 1.1-mm-thick polycarbonate layer. Having the data on top prevents birefringence and therefore prevents readability problems. And, with the recording layer sitting closer to the objective lens of the reading mechanism, the problem of disc tilt is virtually eliminated. Because the data is closer to the surface, a hard coating is placed on the outside of the disc to protect it from scratches and fingerprints.

CD vs DVD vs Blu-ray Writing
The design of the Blu-ray discs saves on manufacturing costs. Traditional DVDs are built by njection molding the two 0.6-mm discs between which the recording layer is sandwiched. The process must be done very carefully to prevent birefringence
  1. The two discs are molded.
  2. The recording layer is added to one of the discs.T
  3. The two discs are glued together.
Blu-ray discs only do the injection-molding process on a single 1.1-mm disc, which reduces cost. That savings balances out the cost of adding the protective layer, so the end price is no more than the price of a regular DVD.

Blu-ray also has a higher data transfer rate -- 36 Mbps (megabits per second) -- than today's DVDs, which transfer at 10 Mbps. A Blu-ray disc can record 25 GB of material in just over an hour and a half.
Blu-ray discs are better armed than current DVDs. They come equipped with a secure encryption system -- a unique ID that protects against video piracy and copyright infringement.

Unlike DVDs and CDs, which started with read-only formats and only later added recordable and re-writable formats, Blu-ray is initially designed in several different formats:
  • BD-ROM (read-only) - for pre-recorded content
  • BD-R (recordable) - for PC data storage
  • BD-RW (rewritable) - for PC data storage
  • BD-RE (rewritable) - for HDTV recording
Physical Media

Physical Media
Recording Speed
Recording Speed

What Is Bluray? Reviewed by Bakhtiyar Sierad - Hosterbyte on Thursday, March 06, 2014 Rating: 5

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