What does the BD version mean?

Recently, some netizens asked: When searching for movies, there will be a BD version. What does it mean?

Answer: BD is the abbreviation of Blue Disk, translated into Chinese is the meaning of "Blu-ray DVD". The laser head of the DVD is now orange-red, and the wavelength of the blue light is smaller, that is, the focus point on the disc is smaller, so that more data can be stored on the same size disc. This is the blue light. The basic principle is that a disc seems to be able to store 50G of content. The Blu-ray player uses a blue laser to read the files on the disc.

Due to the short wavelength of blue light, you can read a denser disc. So why can Blu-ray read and write denser discs? This should be discussed from the laser: The laser for reading and writing is a very accurate light, accurate to the limit, that is, the wavelength of light is generally, because the red wavelength is 700 nm, and the blue light is only 400 nm, so the blue laser actually Can be more precise, can read and write a point of only 200nm, in contrast, the red laser can only read and write 350nm points, so the same disc, more points, the information recorded naturally more! Blue-Ray Disk is a Blu-ray disc. It is one of the next-generation standards for DVD. The main players are Sony and Toshiba. Sony, Panasonic and Philips are the core, and they are supported by giants such as Pioneer, Hitachi, Samsung and LG. The storage principle is a groove recording method, which uses traditional grooves for recording. However, with more advanced dither addressing, it realizes storage and data management for larger capacity, and has now reached a stunning 100GB. Compared to traditional CD or DVD storage formats, BD discs clearly bring better reflectivity and storage density, which is the key to achieving capacity breakthrough.