Disk drive apparatus

Details Disk drive apparatus Disk drive apparatus

1989-04-07

1991-11-19

Canney, Vincent P.

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

G11B 700

Patent

active

050671200

ABSTRACT:
A disk drive apparatus derives 0-order light and 1-order light from an output laser beam of a single laser source, reads a prepit train on a disk by the 0-order light and the 1-order light to reproduce synchronization signals, generates a first synchronization signal based on the synchronization signal reproduced by the 0-order light, and generates a second clock based on the second synchronization signal reproduced by the 1-order light. The synchronization signal reproduced by the 0-order light is delayed by a delay circuit and a selection circuit selects the synchronization signal reproduced by the 1-order light in a write mode or the synchronization signal produced by the delay circuit in a read mode, to generate the second clock. The first clock is used as a data write clock in the write mode and as a data read clock in the read mode. The second clock is used as the data read clock in the write mode.

REFERENCES:
patent: 4835759 (1989-05-01), Saito et al.
patent: 4972401 (1990-11-01), Carasso et al.

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