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
System and method of locating the center of a track on a magnetic storage disk
Robert A. Bremmer
- 12 Aug 1982
TL;DR: In this article, a system and method of accurately locating the center of a previously recorded magnetic track on a rotating magnetic storage disk and moving a transducer to the centre of the track is presented.
36
Patent
Servo circuit for an information recording and/or reproducing apparatus
Hajime Nippon Gakki Seizo K.K. Takao
- 03 Jun 1986
TL;DR: A servo circuit for an information recording and reproducing apparatus such as a Compact Disc player detects relative mechanical vibrations of a pickup head with respect to a recording medium and changes a servo loop gain for positioning the pickup head to a high gain when the level of the detected mechanical vibration is high to obtain a high servo capacity and changes the servo loops gain to a low gain to reduce power consumption and thereby minimize generation of heat.
35
Patent
Read channel having auto-zeroing and offset compensation, and power-down between servo fields
David R. Welland,William G. Bliss +1 more
- 01 Nov 1994
TL;DR: In this paper, a read channel with auto-zeroing and offset compensation is proposed for disk drives. But the read channel is not suitable for disk drive operation and the read operation is not being executed, and it is assumed that the pre-amplifier and charging capacitors in feedback loops are temporarily switched in-circuit.
34
Patent
Low acoustic noise head actuator
Raymond E. Sarraf,Daniel R. Zaharris +1 more
- 14 Sep 1988
TL;DR: In this article, the servo control system is returned in response to a track jump signal to perform track jump operation at a lesser deceleration and thereby reduce low frequency acoustic noise produced by physical vibrations of the disk drive system.
34
Patent
Shielded servo heads with improved passive noise cancellation
Lance E. Stover,Beat G. Keel,John Bortins,Gerald Lee Weispfenning +3 more
- 05 Dec 1990
TL;DR: A servo head in a disk file data storage system includes at least one shield which acts to block radiation emanating from a nearby data head and thus reduce noise induced in the servo heads.
33