Overwritable region of high- and low-light intensity for overwriting on a magnetic triple-layer disk

Ariyoshi Nakaoki; Yoshihiro Mutoh; Shintarou Tanaka; Takashi Shimouma; Kaoruko Asano; Katsuhisa Aratani; Masahiko Kaneko; Kenjiro Watanabe

doi:10.1117/12.22020

1 August 1990 Overwritable region of high- and low-light intensity for overwriting on a magnetic triple-layer disk

Ariyoshi Nakaoki, Yoshihiro Mutoh, Shintarou Tanaka, Takashi Shimouma, Kaoruko Asano, Katsuhisa Aratani, Masahiko Kaneko, Kenjiro Watanabe

Author Affiliations +

Proceedings Volume 1316, Optical Data Storage; (1990) https://doi.org/10.1117/12.22020
Event: Optical Data Storage, 1990, Vancouver, Canada

Abstract

High and low laser power for overwriting was investigated by measuring bit error rate using exchange-coupled triple-layer films. The experimental results revealed that the overwritable region depends both on the state of the medium before overwriting and on the recording pattern. The overwritable region was found to be the least when random data for (2,7) code modulation are overwritten on the initial interface wall state -- the all written state. A margin of was obtained for the low power even under the severest conditions. A laboratory prototype overwriting drive established that the triple-layer disk is applicable to a practical use with a low error rate and that data can be rewritten in about a half time required by the conventional system.

Citation Download Citation

Ariyoshi Nakaoki, Yoshihiro Mutoh, Shintarou Tanaka, Takashi Shimouma, Kaoruko Asano, Katsuhisa Aratani, Masahiko Kaneko, and Kenjiro Watanabe "Overwritable region of high- and low-light intensity for overwriting on a magnetic triple-layer disk", Proc. SPIE 1316, Optical Data Storage, (1 August 1990); https://doi.org/10.1117/12.22020

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