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Prezentace Optical drives_Fábry Martin

Y04A2L - Anglický jazyk 2-2

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ong and CD was used as the data storage as well. Standard CD capacity (650 MB) was sufficient for audio and data, but not for video. So Digital Versatile Disc was presented in 1996. These discs with the size of a CD could carry seven-times bigger amount of information. Now I am talking about standard DVD. There are also variations with a double layer (8,5 GB capacity) and double sided (9,5 GB capacity). As I have already said, progress is unstoppable. But even these capacities (astronomical when you compare them to my first hard disc) are not sufficient for HD (high definition) video. HD video uses format 1080i with the resolution of 1920x1080 pixels. So the story continues. But every good story needs some kind of conflict. The history of CD was one big conflict between companies and pirates breaking easily every copy protection. In the DVD era fought producers of DVD-R and DVD+R. The final battle has begun. There are two opponents fighting for the king’s throne - HD-DVD and Blu Ray. (It is Blu-Ray, not Blue-Ray, because it is impossible to register color as trademark). Both formats have strong supporters; both are using the same size of disc and blue laser with the wavelength of 405 nm.
The biggest difference between HD-DVD and standard DVD is the density of recorded data (15 GB)

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Vloženo: 28.04.2009

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