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

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 n...

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Bibliographic Details
Published in:JPN J APPL PHYS PART 1 REGUL PAP SHORT NOTE REV PAP 2000, Vol.39 (2S), p.756-761
Main Authors: Kasami, Yutaka, Kuroda, Yuji, Seo, Katsuhiro, Kawakubo, Osamu, Takagawa, Shigeki, Ono, Masumi, Yamada, Masahiro
Format: Article
Language:English
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Summary: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%.)
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.39.756