In most ways, Blu-ray is fairly similar to DVD. The players look the same, the discs look the same, and even the disc menus are similar.Blu-ray brings three major improvements over DVD. Firstly blue ray has better image quality than DVD as blue ray disks are read by blue laser,as implied by the name having a bigger wavelength on the other hand DVD is read by a red laser,which has wavelength of 650nm.Secondly better sound quality and more special features as new high-resolution soundtrack formats, such as Dolby TrueHD and DTS-HD Master Audio, are essentially identical to the studio master, so you'll be hearing things exactly as the director and audio engineers intended.All three are made possible by the larger storage capacity of Blu-ray, which is capable of storing 50GB of information on a single Blu-ray Disc, compared with DVDs, which can hold about 8GB.These two discs look identical and actually they are in physical design too.What actually differentiates them is the laser technology but as technology improves we must follow it and prefer Blu-ray rather than the old DVD's.
Petros Panteli
Kostantinos Dimitriou
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