Single beam direct read during write and write protect system for use in an optical data storage system
AssigneeOptotech, Inc.
InventorRoger R. Bracht
Life of this patent
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Abstract
A single beam direct read during write and write protect system for use in an optical data storage system. The optical data storage system includes a reflective-type optical disk, a laser for producing a beam of radiation to write data onto the optical disk during write operations, and a radiation detector for producing write detect signals representative of radiation detected from the optical disk during the write operations. A slope detector produces verification signals indicative of the accuracy of the write operations as a function of a slope of the peaks of the write detect signals. A digital counter is enabled by the verification signals, and produces a write error signal when a predetermined number of inaccurate write operations are detected.
Claims11
Direct read during write apparatus for use in an optical data storage system, including:
- an optical disk;
- laser means for producing a beam of radiation to write data onto the optical disk during write operations;
- radiation detector means for producing signals representative of radiation received from the optical disk, wherein the signals include write detect signals representative of radiation detected during write operations;
- and
- slope detector means responsive to the radiation detector means for producing verification signals indicative of the accuracy of write operations as a function of a slope of the write detect signals.
Dependencies are inferred from the claim text.