The authors are researching and developing a high-density system using a blue-laser diode (LD) and an objective lens numerical aperture (NA) of 0.85, in particular, based on a Blu-ray Disc format, as the next generation of a Digital Versatile DIsc (DVD). In order to win the solid confidence of consumers worldwide in Blu-ray Disc for use at the office and home in the near future, it is most important to realize cost cutting and high-speed recording. Thus, in this paper, a rewritable disc and a dye-type-once disc formed by a spin-coating method, for low-cost and high-speed recording as 36 to 100 Mbps, is proposed.
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