| 摘要 |
PROBLEM TO BE SOLVED: To provide a system capable of suppressing the synchronizing components to efficiently extract them by reducing the time of the learning process for detecting the synchronizing components correlated among plural tracks. SOLUTION: In a head positioning control system using the learning type feedforward control system 30 jointly with the feedback control system, a servo system exciting part 20 for oscillating the head among the plural tracks on the disk by producing the oscillation of the specified frequency different from the frequency which synchronizes to the rotation of the disk, a synchronizing components detecting part 11 for detecting the synchronizing components (eccentric components) based on the observation result of the positional error, and an FW controller 12 for calculating a control value Uf for removing the synchronizing components correlated among the plural tracks from the positional error, are provided as the learning type feedforward control system 30.
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