Difference between BluRay and DVD
Plenty of people have this question – what’s the difference between bluray and dvd? The video quality on them isn’t much different from each other. However the two main differenes are in how information is encoded and decoded from the respective discs.
Encoding information on both discs actually boils down to making little bumps on the surface. These bumps are size of nanometers, so they aren’t really visible to the human eye. So, esentially, a bluray disc has much smaller “bumps” than a DVD has, thus allowing more information to be stored onto a BluRay than on a DVD. A DVD can hold 4.7GB of data, compared to 27GB on a BluRay! The reason for this size difference lies in how the data is decoded.
Both DVD and BluRay readers use lasers to “read” the bumps and make sense out of it. A BluRay, uses a blue laser whereas a DVD uses a red laser. On the light spectrum, blue light has a shorter wavelength than does red. Therefore, the blue laser can focus in on a shorter, smaller bump, thus allowing for smaller bumps to be made on BluRay disc, and therefore more information can be encoded.
Also, a BluRay tranfers information more than 3 times faster than DVD system does.
The commentators talk about the price of these products, because bluray is much costlier than dvd, even though the manufacturing costs of both these producs are about the same. however, is contended that bluray is currently a premium item, and thus is much costlier.
Advertisement
