Importance

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Abstract

A method and system for searching in a track in an optical storage system is disclosed. The optical storage system includes an optical pick up unit (OPU) coupled to a carriage. The method and system comprises receiving a command to indicate that the OPU is to move to a target position of the track. The method and system includes providing first and second output signals, each of the output signals having a rising edge and a falling edge. The rising and falling edges indicate movement of the carriage. The method and system further includes counting each of the rising edges and the falling edges of each of the first and second output signals and providing a sensor count for each of the rising and falling edges; a plurality of sensor counts are provided by movement of the carriage. The method and system finally includes utilizing the plurality of sensor counts to determine the distance the carriage has moved and moving the OPU to the target position based upon the plurality of sensor counts. The spindle speed at each sledge count location can be pre-calculated and stored in the look-up table, and the CLV spindle speed at target radius can be adjusted on the fly and hence reduce the seek time. By using the sledge sensor counts, the surface of the optical disk can be divided into several zones. The spindle speed can be defined and read from a look-up table for zone CAV control scheme. By dividing the disk surfaces into several zones, whenever any seek error happens during the seek operation the system processor can issue the command to re-seek to the target location rapidly without doing the recal procedure.

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First Claim