Tracking and focus digital servo system with write abort
AssigneeDPHI Acquisitions, Inc.
InventorsRon J. Kadlec, Christopher J. Turner, Mike Propps
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Abstract
A write abort algorithm of a tracking and focus servo system that can abort a write operation on an optical disk drive is presented. The write abort algorithm monitors at least one of a tracking error signal or a focus error signal and indicates a write abort status when the tracking error signal or the focus error signal indicates a threshold value. In some embodiments, the write abort algorithms suspends indication of the write abort status in the presence of a defect, suspension of the write abort status occurs more than a predetermined number of times.
Claims16
A method of indicating a write abort status, comprising:
- providing a digital signal processor configured to receive digitized versions of optical sensor signals from an optical pickup unit and calculate an error signal from the digitized versions;
- determining whether the error signal exceeds a threshold value;
- and
- indicating a write abort status when the error signal exceeds the threshold value.
An optical disk drive, comprising:
- an optical pick-up unit;
- a laser mounted in the optical pick-up unit, the laser capable of providing a write power and a read power;
- a laser driver coupled to the laser to control the laser in response to laser signals;
- an analog-to-digital converter coupled to receive signals from detectors in the optical pick-up unit and provide digital versions of the signals;
- at least one processor coupled to receive the digital signals, the at least one processor calculating an error signal from the digital versions to provide control signals and generate the laser signals;
- and a driver coupled to control positions of the optical pick-up unit in response to the control signal, wherein the at least one processor executes an algorithm that performs a write operation and writes data to a writeable portion of an optical media and determines whether the error signal exceeds a threshold value;
- and indicates a write abort status when the error signal exceeds the threshold value.
Dependencies are inferred from the claim text.