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
Disk drive alignment analyzer
Charles R. Bond
- 30 Aug 1983
TL;DR: An alignment testing device comprising a magnetic media with data tracks in nonstandard locations with bidirectionally progressive degrees of misalignment for testing the alignment of the transducer head in a magnetic storage device such as a floppy disk drive is described in this paper.
18
Patent
Positioning misaligned disk heads
Don Steven Keener
- 18 Apr 1986
TL;DR: In this article, a technique for dynamically maintaining alignment of servo controls (12) in a disk (D1, D2) drive system which uses external indicia (Q, R) to position the head assembly (8) between tracks containing embedded servo signals; the latter used to control track following is presented.
17
Patent
Optical data storage and retrieval apparatus
Virgil Erbert
- 28 May 1985
TL;DR: In this article, the authors proposed an optical data storage system that includes automatic compensation for shifting movements of the reading/writing beam and other imperfections which otherwise would affect the focusing or location of focus of a laser light beam onto a data storage record.
17
Magnetoresistive read magnetic recording head offtrack performance assessment
P.I. Bonyhard,J.K. Lee +1 more
- 17 Apr 1990
TL;DR: Simple equations that characterize the offtrack performance of magnetic recording heads with magnetoresistive read are derived and it is shown how these equations can be used to derive the optimum write and read trackwidth for a given application or to derived the track-density potential of a given head.
16
Patent
Compensation method to correct thermally induced off-track errors in disc drives
James Norman Krause
- 19 Nov 1986
TL;DR: In this paper, the transducer is moved in a series of defined increments smaller than normal track-to-track steps, or "micro-steps," away from the uncompensated position of the thermal track toward one of the tracks written with the known frequency.
16