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
Eddy current servo system for controlling the rotation of disk packs
Pearson Willard C
- 31 Jul 1980
TL;DR: In this paper, a servo system provides phase locked servo control of the rotational speed and phase of one, two, or more, disk packs by operating the disk pack, or packs, approximately 2% faster than desired, and then applying a control current to an existing eddy current brake in the disk packs via a servon circuit to reduce the speed to that desired.
11
Patent
Servo signal recording method and apparatus
Ikeda Katsumi
- 14 Aug 1991
TL;DR: In this paper, an external position detector is mounted on a head arm that also carries a transducer for tracking a magnetic disk, and when the head arm is moved at constant speed, the position detector produces an output signal that is periodic but has a measurable pitch error or pitch uneveness.
10
Patent
Servo positioning system for magnetic disk memory including radial runout servo compensation
R Oswald
- 01 Apr 1971
TL;DR: In this article, a first transducer is mounted on a movable arm to indicate the lateral direction and distance from the servo track, and a second transducers is used to measure the velocity of the first transducers for generating a signal indicative of the magnitude of the radial runout existing within a servo positioning system.
10
Patent
Method of setting the track position in a magnetic-tape apparatus
Juergen Dipl Ing Heitmann
- 12 Jan 1989
TL;DR: In this paper, the error rate in the reproduced data signal is determined by the error signal of an error correction circuit with a counter and a register, which is fed to a servo for controlling the feed of the magnetic tape.
9
Patent
Recording medium having improved servo compensation and method for same
Hiroaki Suzuki,Kenji Ogasawara,Kawamura Masaharu,Koji Kurachi +3 more
- 29 Mar 1996
TL;DR: In this article, a mechanism for compensating the servo data in a disk storage drive is provided, where a plurality of servo regions are diametrally formed in data regions along the diametral direction of the disk.
9