Fall detection scheme using FFS
AssigneeWestern Digital Technologies, Inc.
InventorsMin Chen, Sanghoon Chu, Jifang Tian, Zhongjie Li, Hien T. Chu
Life of this patent
Estimating the term…
Abstract
For a disk drive involving a disk; a head; and control circuitry having a servo control system operable to actuate the head, the control circuitry may be configured to determine a magnitude of acceleration readings, the acceleration readings involving at least three degrees of freedom, wherein when a magnitude of the acceleration readings is less than a first threshold, the control circuitry confirms a free fall, wherein when the magnitude is between the first and second threshold, the control circuitry confirms a tilt drop. During the tilt drop and the free fall, the control circuitry is further configured to actuate the head to park and monitor the shock impact.
Claims18
A disk drive comprising:
- a disk;
- a head;
- and
- control circuitry comprising a servo control system operable to actuate the head over the disk, the control circuitry configured to:
- determine a magnitude of acceleration readings, the acceleration readings involving at least three degrees of freedom,
- confirm a free fall when a magnitude of the acceleration readings is less than a first threshold, and
- confirm a tilt drop when the magnitude is between the first and a second threshold.
A control circuitry comprising:
- a servo control system operable to actuate a head over a disk;
- and
- one or more integrated circuits configured to:
- determine a magnitude of acceleration readings for a disk drive, the acceleration readings involving at least three degrees of freedom,
- confirm a free fall when a magnitude of the acceleration readings is less than a first threshold, and
- confirm a tilt drop when the magnitude is between the first and a second threshold.
A method comprising:
- determining a magnitude of acceleration readings for a disk drive, the acceleration readings involving at least three degrees of freedom,
- confirming a free fall when a magnitude of the acceleration readings is less than a first threshold, and
- confirming a tilt drop when the magnitude is between the first and a second threshold.
Dependencies are inferred from the claim text.