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
Systems for worf improvement in conditional servowriting
Richard M. Ehrlich
- 22 Jul 2004
TL;DR: Conditional servowriting as discussed by the authors allows servo information to be written and/or trimmed at a desired location or within a threshold distance of the desired location, if a distance between a write element or a predicted location of servos information and a desired position of the servos or write elements exceeds a threshold.
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Method and apparatus for improving spiral-based position correction system stability via kernel frequency component modification
Bill Ray,Tim Everett +1 more
- 02 Jun 2004
TL;DR: In this paper, a method and apparatus for improving spiral-based position correction system stability via kernel frequency component modification is presented, where a disk drive includes a disk surface with servo information written thereon.
12
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Repetitive error correction method for disk-drive servo control systems
Edward Ying,Pantas Sutardja,Man Cheung +2 more
- 24 Oct 2008
TL;DR: In this article, a computational model is used to determine one or more correction factors to compensate for the RRO generated at each spindle motor rotation by measuring the position errors associated with RRO with respect to a current position of a read/write head.
12
Patent
Method of creating correction table for head position control, head position control method, and disk device
Kazuhiko Takaishi
- 21 Mar 2005
TL;DR: In this paper, a head position control method is proposed to control the position of a head by correcting components synchronizing rotation of a disk based on the head control amount using a filter function that integrates the sine and cosine terms of DFT and inverse DFT.
11
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Systems and methods for doubling sample rate using two-step self-servowriting
Kenji Oki
- 15 Dec 2004
TL;DR: In this paper, a two-step self-servowriting process is used to reduce the noise/runout, eliminate timing eccentricity, and increase the sample rate of the final pattern.
10
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