Optical data recording and reproducing apparatus with erase func

Details Optical data recording and reproducing apparatus with erase func Optical data recording and reproducing apparatus with erase func

1986-12-17

1988-09-06

Richardson, Robert L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 54, 346107R, 360 57, 360 55, 360 60, 360 66, G11B 700

Patent

active

047698047

ABSTRACT:
An optical recording and reproducing apparatus for recording and reproducing data in an optical disk is disclosed. The optical disk has a plurality of erase test sectors in tracks, in one of which the accumulated number of tests together with test data is written. The data read from the erase test sector is compared with the recorded data to effect an erase function diagnosis. If data comparison shows an non-coincidence or the accumulated number of tests exceeds a predetermined value, a new erase test sector is used. The fatigue of the recording medium caused by a defect of the medium or reduced erasing efficiency due to an increased number of erasures of the recording medium is checked by controlling the accumulated number, completely separately from the fault of erase function of the apparatus, thus improving the reliability of the erase function self-diagnosis. Upon detection of an error in the read data or when the accumulated number of tests exceeds a predetermined value, a marking signal is written in the data field of a defective sector, and the apparatus shift to a new erase test sector not yet marked for subsequent erase function self-diagnosis, thereby making possible erase function self-diagnosis without being affected by the fatigue of the recording medium.

REFERENCES:
patent: 4622564 (1986-11-01), Kaku et al.
patent: 4656548 (1987-04-01), Pfefferkorn

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