US 7,095,685 B2 · System and method for detecting and recovering from an off-format state in an optical disc drive

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.

Claims16

Dependent claims

An optical disc drive, comprising:

a tracking actuator;
and
at least one processor operable to receive digitized versions of photodetector signals and to form a tracking error signal from the digitized versions, the at least one processor being further operable to drive the tracking actuator responsive to the tracking error signal, the at least one processor being further operable to determine when the tracking actuator is positioned off a formatted portion of optical media in the disc drive.

Dependencies are inferred from the claim text.

Facts

Application

09/951,332Filed 10 Sep 2001 · us provisional application

Priority

25 Jan 2001

Published

US 2002/0145954 A110 Oct 2002

Granted

22 Aug 2006

Term ends

Not estimatedThe source records don’t support an estimate.

Classification21 codes

G11B 7/1356
Means for guiding the beam from the source to the record carrier or from the record carrier to the detector: double or multiple prisms, i.e.…
G11B 7/08505
With provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing…: methods…
G11B 7/0938
With provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record…
G11B 7/0948
With provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record…

System and method for detecting and recovering from an off-format state in an optical disc drive

Life of this patent

System and method for detecting and recovering from an off-format state in an optical disc drive

Life of this patent

Abstract

Claims16