Blu ray disc

In electronic media, blu-ray discs, developed by Sony corporation and Blu-ray disc association features smaller and more compressed data pits which enables it to store more electronic instructions in a given surface area when compared to DVD media devices. A blu-ray disc has data grooves more than twice smaller than DVD.

In optical storage devices, the data is read by a laser light. In a standard DVD or CD, the machines used to read the grooves on the CD is a red laser. A blu-ray disc on the other hand uses blue laser light and thus, the name blu-ray disc.

Red light has a wavelength of 650 nanometers while blue light has a more shorter wavelength of about 470 nanometers. The blue laser light allows blu-ray discs to possess much smaller data grooves since the blue light spectrum can be focused on a more concentrated area. Blu-ray technology produces a 405 nanometer blue laser compared to a 650 nm red laser that DVD uses.

Since the pits on the blu-ray is much smaller, it allows higher storage capacities given the same amount of surface area. All that extra data space now allows for a lesser need to compress the data. As a result, higher quality picture or sound can be rendered.

Blu-ray discs has a capacity of 25 Gigabytes on a single layer and 50 GB on a double layer. It is capable of displaying 1080p. The data is written on top of the disc which makes it vulnerable to scratches however, a scratch protection hard coat technology called durabis was later implemented for reduced cost than to house the disc on a cartridge.

Companies
Sony corp. ( NYSE: SNE / TYO: 6758) Japan
TDK corp. (TYO: 6762) Japan
Panasonic corp. (TYO: 6752 / NYSE: PC) Japan
Anwell Technologies LTD (SGX: G5X) Hong Kong
Singulus Technologies AG (FWB: SNG) Germany

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