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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 amounts of data on it Data is stored on Blu-Ray disks in the form of tiny ridges on the surface of an opaque 1.1 millimeter thick substrate. This lies beneath a transparent 0.1mm protective layer. 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. Blu- ray 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.