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
Disc drive apparatus
Rob J. M. Coolen,Franciscus Lambertus Maria Cremers,George A. L. Leenknegt,MF Marcel Heertjes +3 more
- 06 Sep 2004
TL;DR: In this paper, a method for detecting a mechanical shock in a disc drive apparatus is described, which comprises the steps of: -determining a shock sensitivity function (SSHOCK) which describes the relationship between shocks (OExT) and said error signal; determining or at least approximating an inverse shock sensitivity functions (S-1SHOCK) as the inverse of said SSHOCK; -and applying said inverse shock sensitivities function (S1-SHocks) on the error signal.
3
Patent
Positioning control system and positioning control method
Yoshiyuki Ishihara,Shinji Takakura +1 more
- 08 Sep 2008
TL;DR: In this paper, a positioning control system including a head moving unit, a position detecting unit, an error detecting unit detecting a position error of the head for a target position, and a disturbance detecting unit detected a non-periodic disturbance was presented.
2
Patent
Methods for conditional servowriting
Richard M. Ehrlich
- 06 Apr 2004
TL;DR: In this paper, it is shown that if a distance between a write element or a predicted location of servo information and a desired location of the servo or write element exceeds a threshold, writing and/or trimming can be inhibited.
2
Patent
Method and apparatus for repeatable run-out compensation
Pantas Sutardja
- 02 Feb 2010
TL;DR: In this paper, a control system is configured to receive an input signal and a compensation module is used to generate an estimate of the repeatable disturbance component based on the error signal, and to combine the estimate with the input signal to compensate for the repeatability component associated with the output signal.
2
Patent
Disk drive generating feed-forward compensation value based on two points of a sinusoidal control signal
Michael Chang
- 21 Jan 2013
TL;DR: In this paper, a disk drive is disclosed comprising a disk comprising tracks defined by servo sectors, a head, and control circuitry comprising a servo control system operable to actuate the head over the disk in response to the servo sector.
1
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