| 摘要 |
A hard disk drive traces a head speed to write data stably on a track of a magnetic disk. The hard disk drive seeks the track to position a head on the track sought, if a few consecutive head position error signals fall within an on-track offset value range, and follows the track sought based on the head position error signal and a head speed. Then, a determination is made as to whether the head position error signal falls within the on-track offset value range, and whether the head speed falls within a predetermined range. If the head position error signal falls within the on-track offset value range and the head speed falls within the predetermined range, then the data will be written on the track. However, if the head position error signal is not within the on-track offset value range or if the head speed is not within the predetermined range, the track following is retried. In this manner, the hard disk drive may accurately follow the track and stably write the data on the magnetic disk.
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