Blu-ray Disc uses a blue laser to achieve a storage capacity of around 25G bytes or around five times that of current DVD discs. It is one of a number of new optical disc storage formats that are being targeted at applications such as storage of high-definition video.Another advantage is that by replacing most of the plastic in a disc with paper it helps the recycling process of manazines bundled with discs.
In a Blu-ray Disc the recording layer on which the data is stored lies under a 0.1mm protective layer and on top of a 1.1mm thick substrate. The substrate, or basic surface on which a material adheres, is usually made of a polycarbonate plastic but the new prototype disc replaces this with paper. The result is a disc of which paper makes up approximately 51 percent of its weight, Sony.
By replacing plastic with paper the companies hope to produce a more environmentally friendly, as well as a more secure disc, said Taro Takamine, a spokesman for Sony in Tokyo.
"Oil is a limited resource but paper can be recycled," he said. "One of the initial advantages of the paper disc will be a decrease in the amount of raw material needed to produce a disc."
The paper disc is also much easier to destroy, so users can actually protect their data by cutting the disc in pieces with a pair of scissors.
Now Sony and Toppan Printing are investigating techniques to be able to mass produce paper Blue Ray discs. Another goal is to make cheaper Blu-Ray Discs. Currently Sony sells blank Blu-Ray discs for around ¥3,500 which is about $32.
Source: Digit Mag