Disk drive idle mode responsive to flex circuit cable bias changes
AssigneeWestern Digital Technologies, Inc.
InventorsJianghong Ding, Zhi Wang
Life of this patent
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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.
Claims20
A 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 being coupled to the actuator by a flex circuit cable, the processor to:
- command 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
- determine if a back electromagnetic force (BEMF) reading associated with the actuator is greater than a threshold value, and if so, exiting the idle mode.
In a disk drive including a disk having a plurality of tracks and an actuator including a head, the actuator being coupled to circuitry of the disk drive by a flex circuit cable, a method to adaptively adjust for flex bias change in the flex circuit cable comprising:
- applying 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
- determining if a back electromagnetic force (BEMF) reading associated with the actuator is greater than a threshold value, and if so, exiting the idle mode.
Dependencies are inferred from the claim text.