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
Disk drive having a servo control system optimized for faster determination of repeatable runout correction values and related method
Li Yi,Hemant Melkote +1 more
- 15 Jun 2005
TL;DR: In this article, a servo control system optimized for faster determination of repeatable runout (RRO) correction values is disclosed, which is based on the distributed servo position information read during a track following operation.
106
Patent
Disk drive updating compensation values for multiple servo sectors based on PES generated for current servo sector
Shan Tang,HengChang Guo +1 more
- 11 Mar 2013
TL;DR: In this paper, a disk drive is disclosed comprising a head actuated over a disk comprising a plurality of servo tracks defined by servo sectors, and a first position error signal (PES) is generated by reading a first servo sector during a first revolution of the disk and in response to a first compensation value.
92
Patent
Magnetic disk device
Masaki Jinbo,Tsuyoshi Furukawa,Hisashi Kaneko,Sugimoto Masaharu,Tsuneyori Ino,Shinichi Fukuzawa,Katsuaki Ishida +6 more
- 09 Jan 2004
TL;DR: In this article, a magnetic disk device with a large available interior space is specified, and a printed circuit board is arranged on the housing and on which a control circuit for controlling the magnetic heads is fastened.
55
Patent
Method and apparatus for dynamic placement of an integration window in a disk drive having a disk surface with spiral servo information written thereon
Bill Ray,John VanLaanen,Liikanen Bruce A +2 more
- 02 Jun 2004
TL;DR: In this paper, a method and apparatus for dynamic placement of an integration window in a disk drive having a disk surface with spiral servo information written thereon is presented, where a read head is provided for reading the spiral servos information and generating a read signal envelope.
44
An iterative learning design for repeatable runout cancellation in disk drives
M.R. Graham,R.A. de Callafon +1 more
TL;DR: The iterative learning control (ILC) framework is considered to design a reference signal that directly cancels periodic disturbances in a feedback measurement to demonstrate the effectiveness of the method in reducing periodic measurement disturbances.
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