Write-once type optical recording/reproducing device

Details Write-once type optical recording/reproducing device Write-once type optical recording/reproducing device

1988-11-14

1991-10-22

Trafton, David

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

367 48, 367 54, 367 58, G11B 509, G11B 390/27/36

Patent

active

050602187

ABSTRACT:
When a record mark portion arranged on the upstream side of a data area is reproduced, the peak value of a reproduction signal of the record mark portion is compared with a reference level. An overwrite preventing circuit is arranged so as to output an inhibiting signal for inhibiting data writing when the comparison output exceeds a predetermined level. With this preventing circuit, a data portion need not be checked in a read mode prior to a write mode.

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patent: 4674071 (1987-06-01), Okumura et al.
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patent: 4815062 (1989-03-01), Suzuki
patent: 4831611 (1989-05-01), Sasaki et al.
patent: 4833662 (1989-05-01), Yoda

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