Patent
Repeatable runout compensation using a learning algorithm with scheduled parameters
YangQuan Chen,LeeLing Tan,KianKeong Ooi,Qiang Bi,Kokhiang Cheong +4 more
- 21 Jan 2000
61
TL;DR: In this paper, a method and apparatus for compensating for written-in repeatable runout in a disc drive is provided, where compensation values are determined through an iterative learning process in which parameters of the learning process such as learning gain, servo loop gain, etc. are functions of the iteration number.
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Abstract: A method and apparatus for compensating for written-in repeatable runout in a disc drive is provided. Compensation values are determined through an iterative learning process in which parameters of the learning process such as learning gain, servo loop gain, etc. are functions of the iteration number. The learning process also employs a nominal double integrator model of an actuator of the disc storage system. The learning process is also a function of a zero-phase low-pass filter.
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Citations
New RRO data collection method for HDD
Qing-Wei Jia,Fu-Cai Wang,Zhong-Feng Wang +2 more
- 16 Aug 2004
TL;DR: In this paper, a new method to collect RRO disturbance data is proposed, where the estimated RRO disturbances obtained from the proposed method will not be affected by the variation of the actuator model.
1
Patent
Optical Disc Apparatus
Shinsuke Onoe
- 26 Mar 2012
TL;DR: In this article, the authors present an optical pickup of the optical disc apparatus that produces a tracking error signal, in general, and execute a tracking servo with using the tracking error signals.
1
Iterative Learning for Periodic Measurement Disturbance Cancellation with Application to Disk Drive Head Testing
M.R. Graham,R.A. de Callafon,Louis J. Shrinkle +2 more
- 01 Jan 2005
TL;DR: In this article, an iterative learning control method for determining disturbance canceling reference signals (DCRS) providing cancellation with periodic measurement disturbances based on closed-loop models is proposed.
Patent
Method of using an integral parameter for correct placement of a read/write head
Hideki Ohzeki,Kenji Okada,Koichi Takeuchi +2 more
- 10 May 1999
TL;DR: In this article, track-following control is performed by detecting the position of a read/write head based on the reproduced output of a servo sector from a channel unit, and makes a calculation of servo data by employing both an integral parameter corresponding to a target track to be read onto a RAM and the detected current position of the read or write head.
References
Patent
Digital servo control system for use in disk drives
Ronald James Kadlec,Thomas James Frederick,Paul Henry Kelley,Philip Saxton Weilbacher +3 more
- 17 Sep 1991
TL;DR: In this article, a servo control system provides adaptive compensation for a variety of tracking and seek problems found in disk drives and is ideally implemented in digital form for accuracy, speed and compactness.
211
Patent
Repeatable runout cancellation in sectored servo disk drive positioning system
Ara W. Nazarian,Charles W. Simmons,Thao P. Trieu,Richard K. Wong +3 more
- 26 Jun 2000
TL;DR: In this paper, the authors propose a method in a magnetic storage disk drive for independently learning and thereafter canceling repeatable runout that is written to the servo fields of each servo track during the writing process.
199
Patent
Disk system with sub-actuators for fine head displacement
Kenji Mori,Hiromu Hirai,Haruaki Otsuki,Tsuyoshi Takahashi,Jun Naruse,Nishimura Yuji,Muneo Kawamoto +6 more
- 26 Jun 1990
TL;DR: In this paper, a magnetic disk system using a voice coil motor and a piezoelectric element provided on a head supporting arm to precisely position a head to a predetermined position on a disk is described.
158
Error rate performance of experimental gigabit per square inch recording components
TL;DR: In this article, the authors measured the on-track and off-track error-rate performance of several combinations of experimental heads and disks using a partial-response channel at approximately 1 Gb/in/sup 2.
149
Patent
Disk drive with primary and secondary actuator drives
Zine-Eddine Boutaghou,Hal Hjalmar Ottesen +1 more
- 30 Aug 1994
TL;DR: In this article, a secondary actuator for increased positional resolution of a read/write head for a DASD is disposed on the distal end of an actuator arm and acts to pivotally move the load beam about the attachment axis.
139