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As people are upgrading to HDTV to enjoy the benefits of digital television (
DTV), the importance of high resolution content is also increasing.
Blu-ray technology is designed to increase storage capacity and of course the quality of video. It uses the same MPEG-2 contraction standard as in DTV, and is highly compatible to meet the global standards for digital broadcasting. To handle the increased amount of data required for maintaining the high quality picture, Blu-ray has a
36 MBPS of data transfer rate. This is more than sufficient to maintain the standards of high definition audio and playback while also maintaining the original picture quality.
Blu-ray disc recordable refers to two different optical disc formats that can be recorded with an optical disc recorder. BD-R disc can be written only once. BD-RE is a rewritable disc. Disc capacities are 25GB and for double layered it is 50GB. There are different versions of BD-R disc and BD-RE disc.
BD-R version 1.2 features an organic dye recording layer. This feature is commonly known as BD-R LTH. It protects the manufacturer’s investment in DVD-R /CD-R manufacturing equipment. It requires modification to current equipment rather than investment in whole new production lines. It is assumed that this can help in reducing the cost of discs.
BD-RE has 3 versions:
Version 1: Has a unique BD file system but it is not compatible with computers.
Version 2: Has a Universal Disk Format (UDF) specification that helps in storage on optical devices. It has a special feature called Advanced Access Content System (AACS), which helps in restricting the access to and copying of optical devices and DVD’s.
Version 3: In the new version, camcorder disc 8cm is included. This version is compatible with version 2. BD-R Version 2 also follows the same specification.
