| 摘要 |
A disk drive with a detector circuit is connected to the distal end of a two-stage actuator. The actuator has a micro actuator for fine track positioning of a read/write head relative to a disk. Intermittent contact between the head and the disk produces forces that are detected and measured by the micro actuator drive circuitry. These measurements are used to determine if excessive contact is occurring between the head and the disk. Alternatively, the present invention also uses a differential method where the output signals from multiple micro actuators are compared to improve noise immunity. In addition, comparisons between the forces at the proximal and distal ends of the micro actuators are used to better identify the source of such forces. For example, this allows the system to distinguish between common mode forces such as those generated by windage and flex cable bias, from forces generated by intermittent head-disk contacts.
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