Published on Feb 12, 2016
Optical disks share a major part among the secondary storage devices.Blu ray Disc is a next .generation optical disc format. The technology utilizes a blue laser diode operating at a wavelength of 405 nm to read and write data. Because it uses a blue laser it can store enormous more amounts of data on it than was ever possible.Data is stored on Blu Ray disks in the form of tiny ridges on the surface of an opaque 1.1 .millimetre .thick substrate. This lies beneath a transparent 0.1mm protective layer.
Description of Blu Ray Disc
With the help of Blu Ray recording devices it is possible to record up to 2.5 hours of very high quality audio and video on a single BD. Blu ray also promises some added security, making ways for copyright protections. Bluray discs can have a unique ID written on them to have copyright protection inside the recorded streams. Blu ray disc takes the DVD technology one step further, just by using a laser with a nice color.
Blu-ray's storage capacity is enough to store a continuous backup copy of most people's hard drives on a single disc. The first products will have a 27 gigabyte (GB) single-sided capacity, 50 GB on dual-layer discs. Data streams at 36 megabytes per second (Mbps), fast enough for high quality video recording Single-sided Blu-ray discs can store up to 13 hours of standard video data, compared to single-sided DVD's 133 minutes. People are referring to Blu-ray as the next generation DVD, although according to Chris Buma, a spokesman from Philips (quoted in New Scientist) "Except for the size of the disc, everything is different."
Blu-ray discs will not play on current CD and DVD players, because they lack the blue-violet laser required to read them. If the appropriate lasers are included, Blu-ray players will be able to play the other two formats. However, because it would be considerably more expensive, most manufacturers may not make their players backward compatible. Panasonic, Philips, and Sony have demonstrated prototypes of the new systems.