System and method for detecting and recovering from an...

Details System and method for detecting and recovering from an... System and method for detecting and recovering from an...

2006-08-22

2006-08-22

Hindi, Nabil (Department: 2656)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044410

Reexamination Certificate

active

07095685

ABSTRACT:
A disc drive includes a tracking actuator, and determines when the tracking actuator is positioned off a formatted portion of optical media in the disc drive. The optical media includes a pitted premastered area that cannot be overwritten and a grooved user-writeable area that can be overwritten. Tracking control effort is monitored to determine when the tracking actuator is in the off-format condition and whether tracking good or tracking bad is detected within a predetermined time period. An absolute value of the tracking control effort is generated and the absolute value of the tracking control effort is filtered. An off-format condition is indicated if the filtered value of the tracking control effort is not within a predetermined threshold value.

REFERENCES:
patent: 5123002 (1992-06-01), Tateishi
patent: 5602689 (1997-02-01), Kadlec et al.
patent: 5875158 (1999-02-01), Schell
patent: 6658201 (2003-12-01), Rebalski

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