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

概要

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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 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 640nm and 407nm wavelengths. With the disk designed for 640nm wavelength, a user capacity of 9.2GB and a user data-transfer rate of 50Mbps were obtained. These quantities were 22GB and 35Mbps with the disk designed for 407nm wavelength. (The disk diameter was 120mm and the format efficiency was 80%.)
社団法人応用物理学会の論文
2000-02-28