In addition to the conventional CD and DVD standards, BD also offers additional ROM, R and RW standards and is promoting the release of the BD / DVD standard, a hybrid format that combines both BD and DVD on one disc, allowing the disc to play both on a BD player as well as on a DVD player.
In addition to the current one-sided disc, coming, BDA will also release the multi-sided BD 2, increasing the capacity up to 100-200 GB, a huge number. The 50 GB disc can store up to 9 hours of movie in high-definition video (HD) and 23 hours in normal format (SD). One of the reasons for manufacturers to believe that BD will dominate the market is the presence and domination of the HDTV (high definition TV). Yes, HD picture can only take full effect on HDTV, but if viewed on normal TV, it will be no different from image from regular DVD. DVDs that are normally played on an HDTV only produce the same images as a CRT TV. Sony’s PS3 products are recommended by manufacturers to use with new HDTVs.
We all know the stereo format is 2-channel audio in uncompressed form, while digital (5.1, 6.1, 7.1) is compressed audio, According to BD manufacturers with 8 uncompressed channels (so it is not stereo anymore, but I don’t know how to call it right), but because the reader normally only reproduces 2 channels only. As for the digital audio formats, all BD players are reproducing 5.1 Dolby Digital sound but with a higher signal rate, so the quality is also much better. In addition, BD also supports formats for 7-channel (Dolby Digital Plus 7.1), 8-channel (Dolby True HD and DTS-HD Master Audio) audio. In theory, the BD can provide up to 32 individual audio channels (if you have an amplifier and speakers that can receive and process that many audio signals at the same time).
The only problem facing BD users nowadays is the price. It is still too high compared to DVD, both in terms of player as well as program disc (white BD disc sold in the US is about 30 USD / unit, the lowest player is about 500 USD). However, it is possible that only in a short time, when this technology explodes in the market, prices will drop as quickly as DVD before. Not far away, blu-ray will become familiar to everyone.