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
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Toshiyuki Haruna,Kenji Nishimura,Yoshida Yuji,Kiyotaka Takahashi,Tsuneo Hirose,Katsuhiro Tsuneta,Riichi Nakano,Kazuto Takahashi,Akira Kurano,Tadayuki Ichiba +9 more
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TL;DR: In this paper, a magnetic disk unit for recording/reproducing data onto/from a disc by means of a magnetic head on the basis of a seek command and a recording or re-reproducing command received from a host processor is started upon detection of a state that the magnetic head has sought on a desired track.
14
Patent
Servo control system carrying out coarse control and fine control
Keiichi Kohno
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TL;DR: In this article, a servo control system with a coarse control unit and a fine control unit is described, where a differential gain is changed temporarily during a short period at an initial state of fine control to shorten a settling time and to reduce overshoot.
14
Patent
Method and apparatus for controlling the error correction within a data transmission controller given data read from moving peripheral storages, particularly disk storages, of a data processing system
Eckardt Weiss,Peter Wentzel +1 more
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TL;DR: In this article, all required data blocks are read in one pass and are transferred into a correspondingly enlarged buffer memory (DAT-SP) to reduce the time losses that arise when reading a plurality of successive data blocks, because of the interruption of the read operation in the case of recognized data errors.
14
Patent
Velocity/position estimator of magnetic head in magnetic disk driving apparatus
Jung-Ho Lee,Jeom-Geun Kim +1 more
- 23 Jul 1996
TL;DR: In this article, a magnetic disk drive apparatus includes a velocity/position estimator of a magnetic head, in which a gain can automatically be adjusted in accordance with a moving velocity of the magnetic head.
13
Patent
Servo error controls
William Wai-Chung Chow,Alan August Fennema,Kadlec Ronald James +2 more
- 14 Jun 1990
TL;DR: In this article, a pair of clamp circuits are electrically interposed between the servo actuator drive signal generation and a run-out compensation circuit such that the clamping operation does not alter the runout compensation.
13