1 August 1990 Direct overwriting of magneto-optical disk
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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.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hiroshi Inoue, Hiroshi Inoue, Yasunobu Hashimoto, Yasunobu Hashimoto, Kazuo Nakashima, Kazuo Nakashima, Miyozo Maeda, Miyozo Maeda, Seiya Ogawa, Seiya Ogawa, } "Direct overwriting of magneto-optical disk", Proc. SPIE 1248, Storage and Retrieval Systems and Applications, (1 August 1990); doi: 10.1117/12.19624; https://doi.org/10.1117/12.19624


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