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
Iterative Learning Control: Brief Survey and Categorization
Hyo-Sung Ahn,YangQuan Chen,Kevin L. Moore +2 more
- 01 Nov 2007
TL;DR: The iterative learning control (ILC) literature published between 1998 and 2004 is categorized and discussed, extending the earlier reviews presented by two of the authors.
1.6K
Iterative learning control and repetitive control in hard disk drive industry—A tutorial
TL;DR: In this article, a tutorial on iterative learning control (ILC) and repetitive control (RC) techniques in hard disk drive (HDD) industry for compensation of repeatable runouts (RRO) is presented.
151
Iterative Learning Control and Repetitive Control in Hard Disk Drive Industry - A Tutorial
YangQuan Chen,Kevin L. Moore,Jie Yu,Tao Zhang +3 more
- 01 Dec 2006
TL;DR: This paper presents a tutorial on iterative learning control (ILC) and repetitive control (RC) techniques in hard disk drive (HDD) industry for compensation of repeatable runouts (RRO).
143
Patent
Method for recursively determining repeatable runout cancellation values in a magnetic disk drive
Hemant Melkote,Russ A. Quisenberry +1 more
- 30 Sep 2002
TL;DR: In this paper, a method for recursively determining repeatable runout (RRO) cancellation values in a disk drive having a head disk assembly (HDA) and a sampled servo controller is disclosed.
128
Patent
Method for improved repeatable run out learning in a disk drive
Zhi Wang,Hien T. Chu,Jenghung Chen +2 more
- 31 Oct 2006
TL;DR: In this paper, a method for determining fundamental-frequency repeatable runout (1FRRO) coefficients in a disk drive is presented. But the method is restricted to the case where the transducer head is caused to move in a substantially constant velocity motion across a selected portion of the tracks of the rotating magnetic disk in response to a control signal.
110
References
Patent
Servo system with once per revolution rejection
Larry Hutsell
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TL;DR: In this article, a servo system for controlling the position of a read/write head over a rotating data disk is described, which includes a compensation scheme to the feedback loop that causes the open loop gain of the servo to increase only in a very narrow spectrum of its operating bandwidth.
25
Demonstration of 500 megabits per square inch with digital magnetic recording
TL;DR: In this paper, the authors describe the testing and modeling methods undertaken to demonstrate and verify an areal density of 500 Mb/in/sup 2/ with a combined inductive, thin-film write head and a magnetoresistive read head on an advanced, state-of-the-art thin-filtered disk.
24
Patent
Method and system for a magnetic disk drive employing a quadratic compensation function for determining an offset correction value
Toshihiko Makino,Makoto Nagasawa +1 more
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TL;DR: In this article, the authors propose a head positioning system for use with a magnetic disk with outer, middle and inner servo tracks which are radially separated by data tracks, and a determining element which determines an offset correction value for a targtet data track included in the data tracks in accordance with a quadratic compensation function and the first, second and third deviation values.
24
Patent
Time dependent velocity-controlled disk drive actuator system
A Hunter Dan
- 05 Jun 1996
TL;DR: In this article, a self-tuning estimator that is calibrated during operation of a disk drive is used to adjust the actuator resistance in the reconstruction of the back EMF voltage.
24
Patent
Method for writing servo patterns to a disc of a hard disc drive
Donald W. Janz
- 29 Aug 1991
TL;DR: In this paper, a method of writing servo patterns to the surface of a disc of a hard disc drive without magnetizing the transducer head by means of which the patterns are written was proposed.
23