| 摘要 |
A system comprises a positioning module that positions an actuator arm to read spirals that are prewritten. A frequency measuring module measures a first frequency of sync marks of said spirals. An estimation module calculates a second frequency of said sync marks when said actuator arm moves at a predetermined actuator velocity. A control module calculates an actuator velocity at which said spirals are prewritten based on said first frequency, said second frequency, and said predetermined actuator velocity.
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