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Proceedings Paper

Direct overwriting of magneto-optical disk
Author(s): Hiroshi Inoue; Yasunobu Hashimoto; Kazuo Nakashima; Miyozo Maeda; Seiya Ogawa
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Paper Abstract

The possibility of direct overwriting in magneto-optical (MO) disk is demonstrated. By a modfied frequency modulation technique of laser pulse, erasing of recorded bits could be accomplished on the rotating disk. We measured the erasure characteristics for GdTbFe films prepared by RF magnetron sputtering, and found that erasure performance depended on the frequency and the power of the laser pulse and on the magnetic field. We also found that there was an optimum power for erasing the recorded bits. Our experiment produced almost the same rewriting carrier-to-noise ratio (CNR) as the original CNR under a weak constant magnetic field. We confirmed that direct overwriting in MO disk is possible by using a two-beam technique and that read-before-write scheme which makes a drive complex is unnecessary.

Paper Details

Date Published: 1 August 1990
PDF: 5 pages
Proc. SPIE 1248, Storage and Retrieval Systems and Applications, (1 August 1990); doi: 10.1117/12.19624
Show Author Affiliations
Hiroshi Inoue, Fujitsu Labs. Ltd. (Japan)
Yasunobu Hashimoto, Fujitsu Labs. Ltd. (Japan)
Kazuo Nakashima, Fujitsu Labs. Ltd. (Japan)
Miyozo Maeda, Fujitsu Labs. Ltd. (Japan)
Seiya Ogawa, Fujitsu Labs. Ltd. (Japan)


Published in SPIE Proceedings Vol. 1248:
Storage and Retrieval Systems and Applications
David H. Davies; Han-Ping D. Shieh, Editor(s)

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