Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Reexamination Certificate
2006-07-18
2006-07-18
Wong, K. (Department: 2627)
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
C360S075000
Reexamination Certificate
active
07079338
ABSTRACT:
A method in a dual-stage actuator disk drive tests if the secondary actuator has failed while the disk drive is in its normal track-following operating mode. The secondary actuator is removed from the control loop and the primary actuator maintains the read/write head on a data track in the track-following mode. The servo control processor generates a test signal to the secondary actuator and receives the position error signal (PES) as the read head detects the PES bursts in the data track being followed. The servo control processor calculates the response of the secondary actuator to the test signal by deconvolving the motion of the primary actuator from the PES. The calculated response is then compared with an expected response to determine if the secondary actuator has failed. The coherence function can be calculated to measure the statistical validity of the calculated secondary-actuator frequency response.
REFERENCES:
patent: 5936805 (1999-08-01), Imaino
patent: 5959808 (1999-09-01), Fan et al.
patent: 6088187 (2000-07-01), Takaishi
patent: 6292320 (2001-09-01), Mason et al.
patent: 6483659 (2002-11-01), Kobayashi et al.
patent: 6611399 (2003-08-01), Mei et al.
patent: 6768610 (2004-07-01), Morris et al.
patent: 2005/0122607 (2005-06-01), Zhu et al.
L.S. Fan et al., “Electrostatic Microactuator and Design Considerations for HDD Applications”, IEEE Transactions on Magnetics, vol. 35, No. 2, Mar. 1999, pp. 1000-1005.
Y. Lou et al., “Dual-Stage Servo With On-Slider PZT Microactuator for Hard Disk Drives”, IEEE Transactions on Magnetics, vol. 38, No. 5, Sep. 2002, pp. 2183-2185.
T. Semba et al., “Dual-stage servo controller for HDD using MEMS microactuator”, IEEE Transactions on Magnetics, vol. 35, Sep. 1999, pp. 2271-2273.
M. T. White et al., “Use of the Relative Position Signal for Microactuators in Hard Disk Drives”, Proceedings of the American Control Conference, Denver, Colorado, Jun. 4-6, 2003, pp. 2535-2540.
Semba Tetsuo
White Matthew T.
Yamamoto Satoshi
Berthold Thomas R.
Hitachi Global StorageTechnologies Netherlands B.V.
Slavitt Mitchell
Wong K.
LandOfFree
Dual-stage actuator disk drive with method for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dual-stage actuator disk drive with method for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual-stage actuator disk drive with method for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3533106