Matsushita has announced the ‘worlds first’ optical rewritable disc technology that will mean 50Gb of storage per disc.
The technology uses a 10mW blue laser (as opposed to the red lasers used in DVD and CD drives, which also draw 10mW) to read a dual-layer optical disc. The top layer is semi-transparent and only six nanometres thick. Between them, this results in a single 50Gb capacity disc with playback and recording rates of 33Mbits/sec, three times faster than current DVD technology. With such a disc you could record four hours of digital TV at 25Mbits/sec.
The film layers of the disc are made from germanium anitmony tellurium which can be overwritten in excess of 10,000 times. The two layers are slightly misaligned, allowing them to be accessed from the same side of the disc.
The company intends to use the technology in future optical disc recorders.