Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1997-07-22
1999-03-16
Huber, Paul W.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 58, G11B 2736
Patent
active
058838686
ABSTRACT:
A magneto-optical disk recording device for recording and reproduction using a one-beam optical head and includes a magneto-optical head, a reproduction amplifier, an erase failure detection circuit, a reflected light quantity detection circuit, and an erase judging circuit. The reproduction amplifier amplifies a magneto-optical reproduction signal and a reflected light quantity read out by the magneto-optical head during recording. The erase failure detection circuit receives a magnetic data output from the reproduction amplifier and detects a reproduced signal state during erasing. The reflected light quantity detection circuit outputs a signal when the reflected light is less than a threshold. The erase judging circuit judges whether to skip an erase failure region or to re-erase and verify the erased state.
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Huber Paul W.
NEC Corporation
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