Evaluation of a 120 mm Sized Magneto optical Disk System of Over 6 GB Capacity.

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  • Tanaka Yasuhito
    Multimedia Systems R & D Division, Hitachi, Ltd., 292 Yoshida–cho, Totsuka–ku, Yokohama, Kanagawa244, Japan
  • Sumi Satoshi
    Hypermedia Research Center, Sanyo Electric Co., Ltd., 180 Ohmori, Anpachi–cho, Anpachi–gun, Gifu 503–01, Japan
  • Matsubayashi Nobuhide
    Optical Memory Business Department, Olympus Optical Co., Ltd., 2951 Ishikawa–cho, Hachioji, Tokyo192, Japan
  • Sato Hideaki
    Image and Media Laboratory, Sharp Corporation, 2613–1 Ichinomoto–cho, Tenri, Nara 632, Japan
  • Murakami Yoshiteru
    Precision Technology Development Center, Sharp Corporation, 2613–1 Ichinomoto–cho, Tenri, Nara 632, Japan
  • Awano Hiroyuki
    Recording Media Research Laboratory, Hitachi Maxell Ltd., 6–20–1 Kinunodai, Yawara–mura, Tsukuba–gun, Ibaraki 300–24, Japan
  • Matsuura Michio
    Fujitsu Laboratories Ltd., 64 Nishiwaki, Ohkubo–cho, Akashi, Hyogo 674, Japan
  • Fujita Goro
    Optical Media Laboratory, Advanced Development Laboratories, Sony Corporation, 6–7–35 Kitashinagawa, Shinagawa–ku, Tokyo 141, Japan
  • Watanabe Tetsu
    Optical Media Laboratory, Advanced Development Laboratories, Sony Corporation, 6–7–35 Kitashinagawa, Shinagawa–ku, Tokyo 141, Japan

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We have studied the feasibility of the 120-mm-sized magneto optical disk system which achieves 6-GB user capacity using an optical pickup with a 640-nm wavelength laser and a 0.6-numerical aperture of the objective lens. We have used three technologies: a laser-pulsed magnetic-field modulation recording, a center-aperture-detection type of magnetically-induced super resolution disk with a 0.6-mm-thick single substrate and partial response equalization with maximum likelihood detection. We have evaluated the system-margins of write power, radial tilt, tracking and focusing offset and have confirmed the feasibility of the linear bit density of 0.235 µ m/bit in 0.6-µ m track pitches.

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