Pedro Trebbau Lopez
The Blu-ray name comes from the color of the laser that reads and writes the discs, which is blue, but another fact is that the word blue had the “e” letter removed for registration and patenting purposes. It is also beginning to be known only as BD.
The Blu-ray disc is a circular plate with a 120 mm diameter and 1 mm thick which has a high resistance to scratches and it integrates a paper label for ID purposes. Bits are stored by mean of microscopic grooves on its surface, performed by a blue laser beam. The recording has a unique spiral track which is written sequentially. However, the reader unit reads it randomly. This technology was supported mainly by Sony , Apple and HP, and was introduced to the commercial market in 2008.