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
Patent
Optimally designed parsimonious repetitive learning compensator for hard disc drives having high track density
YangQuan Chen,MingZhong Ding,Lincheng Xiu,KianKeong Ooi,LeeLing Tan +4 more
- 12 Jan 2001
TL;DR: In this paper, the authors proposed tuning the repetitive learning compensator with a phase advance represented by N PA and a cutoff frequency f c, where NPA and f c are selected as a pair to provide the greatest transfer function amplitude at the harmonic frequencies.
36
Repeatable runout compensation for hard disk drives using adaptive feedforward cancellation
Shang-Chen Wu,Masayoshi Tomizuka +1 more
- 14 Jun 2006
TL;DR: New methods to estimate repeatable runout (RRO) in hard disk drives are proposed based on adaptive feedforward compensation based on Reidual error shaping and Kalman filtering.
35
Repeatable runout disturbance compensation with a new data collection method for hard disk drive
Qing-Wei Jia,Zhong-Feng Wang,Fu-Cai Wang +2 more
- 22 Feb 2005
TL;DR: Experimental results show that the servo tracking performance can be significantly improved by using the estimated disturbance to compensate the actual RRO disturbances.
34
Patent
Random vibration and shock compensator using a disturbance observer
Qing-Wei Jia,MingZhong Ding,KianKeong Ooi,JianYi Wang +3 more
- 19 Sep 2005
TL;DR: In this paper, a data storage device adapted to compensate for physical disturbances has a storage medium, a read-write mechanism positionable relative to the storage medium and a disturbance observer.
34
Patent
Repeatable runout compensation in a disc drive
Tao Zhang,John C. Morris,Thomas C. Zirps +2 more
- 22 Oct 2002
TL;DR: In this paper, a system and method for correcting repeatable runout errors during the manufacturing of a disc drive is presented, which includes a Kalman filter having a recursive learning gain input and includes a recursive-learning Again-setting circuit coupled to the recursive learning gains input.
34
References
Patent
Digital servo control system for use in disk drives
Ronald James Kadlec,Thomas James Frederick,Paul Henry Kelley,Philip Saxton Weilbacher +3 more
- 17 Sep 1991
TL;DR: In this article, a servo control system provides adaptive compensation for a variety of tracking and seek problems found in disk drives and is ideally implemented in digital form for accuracy, speed and compactness.
211
Patent
Repeatable runout cancellation in sectored servo disk drive positioning system
Ara W. Nazarian,Charles W. Simmons,Thao P. Trieu,Richard K. Wong +3 more
- 26 Jun 2000
TL;DR: In this paper, the authors propose a method in a magnetic storage disk drive for independently learning and thereafter canceling repeatable runout that is written to the servo fields of each servo track during the writing process.
199
Patent
Disk system with sub-actuators for fine head displacement
Kenji Mori,Hiromu Hirai,Haruaki Otsuki,Tsuyoshi Takahashi,Jun Naruse,Nishimura Yuji,Muneo Kawamoto +6 more
- 26 Jun 1990
TL;DR: In this paper, a magnetic disk system using a voice coil motor and a piezoelectric element provided on a head supporting arm to precisely position a head to a predetermined position on a disk is described.
158
Error rate performance of experimental gigabit per square inch recording components
TL;DR: In this article, the authors measured the on-track and off-track error-rate performance of several combinations of experimental heads and disks using a partial-response channel at approximately 1 Gb/in/sup 2.
149
Patent
Disk drive with primary and secondary actuator drives
Zine-Eddine Boutaghou,Hal Hjalmar Ottesen +1 more
- 30 Aug 1994
TL;DR: In this article, a secondary actuator for increased positional resolution of a read/write head for a DASD is disposed on the distal end of an actuator arm and acts to pivotally move the load beam about the attachment axis.
139