Patent ID: 8059501

Claim:
An optical disk drive for scanning an optical disk comprising a substantially circular track with a scanning velocity, the optical disk drive comprising: an optical source for generating an incident beam, an optical arrangement for focusing the incident beam into a spot on the optical disk, a disk speed controller for moving the optical disk with the scanning velocity relative to the spot, a servo system for controlling the position of the spot relative to the optical disk, a sensor for sensing a reflected beam produced by the optical disk upon receiving the incident beam, and for producing a sensor output signal comprising at least a servo error signal, the servo system comprising a servo controller and a servo actuator, and the servo controller being arranged to: receive the servo error signal, determine a first performance indicator of the servo actuator in dependence on at least the servo error signal while the spot is focused at a read power level, compare the first performance indicator against a first pre-determined threshold for determining a first servo margin, and set the scanning velocity in dependence on at least the first servo margin and only after setting the scanning velocity in dependence on at least the first servo margin, the optical disk is scanned for writing marks on the optical disk.