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
Adaptive window centering
Robert D. Cronch,Mark D. Hertz,Hieu V. Nguyen +2 more
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TL;DR: In this paper, window center settings in a read channel of a magnetic disk drive are controlled based on the number of read errors detected and the error types determined, and adjustment of the window center is made based on these errors.
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Patent
Information storage device using a rotary recording medium
Sega Masahiko,Jiro Kaneko,Tsuyoshi Takahashi +2 more
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TL;DR: In this article, a pneumatic spring is used to attenuate the reaction force using its own throttle hole to reduce a proper vibration frequency of the positioning mechanism to such an extent that an electrical servo system can catch the vibration frequency and can hold down a location error.
11
Patent
Signal reproducing device which offsets the tracking error signal for a digital tape player
Seiichi Yokozawa
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TL;DR: In this article, a head assembly traces tracks on which predetermined digital data and tracking pilot signals have been recorded, the head assembly having a larger tracking width than the tracks, and the pilot signal is detected from the reproduction output of the head assemblies to form a tracking error signal.
11
Patent
Position control apparatus and method with a digital filter and a phase change filter section in a disk storage device
Masashi Kisaka
- 16 May 1996
TL;DR: In this paper, the main control section is provided with a digital filter 86 so that the head position signal Y(N) is input, which represents the size and direction of the deviation of the current position of a magnetic head to the target position in terms of a digital value.
11
Patent
Method and apparatus for reducing track switch latency in a disk drive
Clark Alan Anderson,Todd Barry Anderson,Gerald Lawrence Cadloni,Earl Albert Cunningham,Michael Scott Hicken,Daniel D. Reno,John Jeffrey Stephenson +6 more
- 28 Oct 1992
TL;DR: In this paper, track switching latency in a disk drive is reduced by overlapping pre-movement portions of the track switching process with the data transfer operation of the currently active recording head.
11