Optical information recording and reproducing apparatus having a

Details Optical information recording and reproducing apparatus having a Optical information recording and reproducing apparatus having a

1988-03-02

1990-11-06

Faber, Alan

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 47, 369 58, 358342, G11B 700, G11B 2736

Patent

active

049691392

ABSTRACT:
The apparatus includes a one-chip microcontroller, an error flag counter and an error comparison circuit to detect whether or not an optical disk or an internal optical head of the apparatus is fouled. Test data is recorded on a self-diagnostic area of the optical disk when the optical disk loaded in the apparatus is new and has not yet been used, and initial error information detected in the test data reproduced from the self-diagnostic area is registered on an error managing area of the optical disk. When an optical disk which has already been used is loaded, error information detected in the test data recorded on and reproduced from the self-diagnostic area of the optical disk is compared with the initial error information registered in the error managing area of the optical disk. When the comparison shows that the number of data errors is greater than a predetermined reference value, the optical disk or the internal optical head is fouled to such an extent that the recording and reproducing function cannot be satisfactorily performed.

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