What's the working principle of Blu ray discs?

Answer:

its recording unit - groove (or material unit) 0.14mm diameter than the red DVD disc 0.4mm blue DVD single groove single disk storage capacity, the definition of 23.3GB 25GB27GB high capacity (27GB) before the red DVD single-sided single disk capacity (4.7GB) in 6 times over 2 foot storage playback of high definition digital video content between 13 or more TV programs play standard (VHS standard image quality)The price of each difference that Blu ray recorders 1200-1500 yuan 20-30 yuan blue disc Blu ray player 1000 yuan now drop

A blu ray burner: blue light CD burner and ordinary burner difference: popular before the DVD technology adopts 650nm digital wave red laser focusing mirror aperture 0.6 0.6mm Blu ray disc thickness DVD technology using 450nm wave blue violet laser through a wide-angle lens aperture ratio of 0.85 digital power spot size shrink degree blue DVD disc structure using 0.1mm thick light transparent protective layer to reduce disk read and write process due to tilt turn made loss so that the disc data reading easier and improve the storage density can provideDVD Blu ray disc track spacing is reduced to 0.32mm just before the red DVD disc half;