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
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Patent
Thermal offset compensation for high density disk drives
LeRoy A. Volz,Haim N. Nissimov +1 more
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TL;DR: In this paper, a thermal offset compensation system is provided for use in a computer disk drive unit with a dedicated servo surface on one of a plurality of memory storage disks, where the average offset of the data heads, taken collectively, is determined and subsequently compensated-for when any data head is utilized to read or write data on a selected track.
51
Patent
Compensating for variations in torque capability of voice coil motors
Otis L. Funches,Randall D. Hampshire,Vladimir Kovner +2 more
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TL;DR: In this paper, a method for compensating for position and component induced variations in the acceleration and deceleration capabilities of a voice coil actuator in a disc drive, comprising the steps of dividing the discs radially into a plurality of zones, is presented.
51
Patent
Cancellation and calibration procedures of harmonic disturbances in magnetic data storage systems
Ho Seong Lee,Alan SunTzi Shih,Steven Wayne Burge,Mark Andrew Pajdowski +3 more
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49