High-Speed Recording Media for HD DVD Rewritable System

概要

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We have developed optical recording media for high-speed operation on the HD DVD rewritable (HD DVD-R) format, which uses a laser wavelength of 405 nm, a numerical aperture of the objective lens of 0.65 and a cover layer thickness of 0.6 mm. In this study, we optimized the amount of bismuth substitution for antimony in pseudo-binary GeTe–Sb2Te3 alloy recording film and inserted interface layers to achieve high-speed recording and sufficient thermal stability in our media. As the amount of bismuth substitution increased, the erase ratio of the media improved. The rewritable media in which all the antimony is substituted by bismuth, i.e., the media having GeTe–Bi2Te3 alloy recording film achieved a sufficient erase ratio at a linear velocity 2.4 times that of the previous study without sacrificing the good thermal stability of amorphous marks. We demonstrate the operation of the media at data transfer rates ranging from 36.55 to 87.72 Mbps.
2006-02-15