BEMF closed loop control of disk drive actuator during a catastrophic event

摘要

A disk drive includes an actuator assembly and a controller. The actuator assembly generally includes an actuator having a velocity and a voice coil motor that has a detectable back electromotive force (BEMF). The actuator assembly is configured to position a read/write head. The controller is coupled to the actuator assembly and is configured to detect a catastrophic event occurring within the disk drive. In response to the detection of the catastrophic event, the controller activates a closed loop controlled slowing of the velocity using the detected BEMF as a control parameter.

主权项

1. A disk drive, comprising:
an actuator assembly configured to position a read/write head, the actuator assembly having a velocity and a detectable back electromotive force (BEMF); a controller coupled to the actuator assembly, the controller configured to detect a catastrophic event occurring within the disk drive, wherein in response to the detection of the catastrophic event the controller activates a closed loop controlled slowing of the velocity, wherein the closed loop controlled slowing utilizes detected BEMF of the actuator assembly as a control parameter.