Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-11-17
2009-06-02
Wong, K. (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S069000
Reexamination Certificate
active
07542225
ABSTRACT:
Disclosed is disk drive comprising an actuator including a head, a disk having a plurality of tracks, and a processor to control the movement of the actuator and the head relative to the disk. The processor is coupled to the actuator by a flex circuit cable. The processor commands the application of a pre-calibrated bias signal to the actuator during an idle mode to compensate for a bias force imparted by the flex circuit cable upon the actuator such that the head is maintained proximate a pre-determined track of the disk within a pre-determined idle zone of tracks and further determines if a back electromagnetic force (BEMF) reading associated with the actuator is greater than the threshold value, and if so, commands an exit out of the idle mode.
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Ding Jianghong
Wang Zhi
Blakely & Sokoloff, Taylor & Zafman
Western Digital Technologies Inc.
Wong K.
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