Manufacturing Industry
Hitachi, Maxell develop multilayer optical disc for terabyte recording. (Optoelectronics).(Brief Article)
New Materials Japan, August, 2003
Hitachi Ltd and Hitachi Maxell Ltd have jointly developed a new basic technology for making multilayer optical discs. This technology has made it possible to achieve terabyte-level large-capacity storage in a 12 cm-diameter optical disc.
Already, double-layered DVD-ROMs are available as multilayer optical discs. However, the conventional disc is limited in the number of layers it can have. When a disc has more than five layers, reflective light from the lower layer becomes too weak and the disc is thus no longer suitable for use as a recording medium.
The new technology adopts an electrochromic material in the recording layer of the optical disc, which changes colour when the voltage is increased. With this material, layers that are not used for...
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