Large Capacity and High-Data-Rate Phase-Change Disks.

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  • Kasami Yutaka
    Development Center, Home Network Company, Sony Corporation, 6-7-35 Kitashinagawa, Shinagawa-ku, Tokyo 141-0001, Japan
  • Kuroda Yuji
    Development Center, Home Network Company, Sony Corporation, 6-7-35 Kitashinagawa, Shinagawa-ku, Tokyo 141-0001, Japan
  • Seo Katsuhiro
    Development Center, Home Network Company, Sony Corporation, 6-7-35 Kitashinagawa, Shinagawa-ku, Tokyo 141-0001, Japan
  • Kawakubo Osamu
    Development Center, Home Network Company, Sony Corporation, 6-7-35 Kitashinagawa, Shinagawa-ku, Tokyo 141-0001, Japan
  • Takagawa Shigeki
    Development Center, Home Network Company, Sony Corporation, 6-7-35 Kitashinagawa, Shinagawa-ku, Tokyo 141-0001, Japan
  • Ono Masumi
    Development Center, Home Network Company, Sony Corporation, 6-7-35 Kitashinagawa, Shinagawa-ku, Tokyo 141-0001, Japan
  • Yamada Masahiro
    Development Center, Home Network Company, Sony Corporation, 6-7-35 Kitashinagawa, Shinagawa-ku, Tokyo 141-0001, Japan

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Large-capacity phase-change disks permitting higher data-transfer rates have been developed for 0.85-numerical-aperture (NA) recording systems. Three methods to improve the recording data rate were examined. First, the recording layer was sandwiched by ceramic layers for the purpose of promoting nucleation. Second, signal properties were evaluated with a disk that had a so-called absorptivity-controlled structure. Third, these two methods were combined so that they functioned together in one disk. The disk structure was optimized separately for 640 nm and 407 nm wavelengths. With the disk designed for 640 nm wavelength, a user capacity of 9.2 GB and a user data-transfer rate of 50 Mbps were obtained. These quantities were 22 GB and 35 Mbps with the disk designed for 407 nm wavelength. (The disk diameter was 120 mm and the format efficiency was 80%.)

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