08467144 is referenced by 11 patents and cites 5 patents.

A multi-stage tracking control system includes at least a main actuator and a microactuator. The tracking control system is switched to a single-stage mode so that the main actuator alone provides tracking. A disturbance signal is applied to the microactuator while in the single-stage mode, and a failure condition of the microactuator is determined based on a position error generated in response to the disturbance signal.

Title
Determining microactuator failure in a multi-stage tracking system
Application Number
13/102691
Publication Number
8467144 (B2)
Application Date
May 6, 2011
Publication Date
June 18, 2013
Inventor
KianKeong Ooi
Singapore
SG
Mingzhong Ding
Singapore
SG
Choon W Ng
Singapore
SG
Yuheng Wang
Singapore
SG
Bi Qiang
Singapore
SG
Chi Zhang
Singapore
SG
Kang Hai Lim
Singapore
SG
Agent
Hollingsworth Davis
Assignee
Seagate Technology
CA, US
IPC
G11B 5/596
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