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
System and method for reducing ZAP time and track squeeze in a data storage device
Xiong Liu,Qiang Bi,TzeMing Jimmy Pang,ChoonKiat Lim +3 more
- 24 Feb 2004
TL;DR: In this article, an improved zero acceleration path (ZAP) correction technique is provided, wherein selected tracks of a data storage device are used for ZAP processing in order to reduce the overall time required to perform error compensation for a storage device.
32
Patent
Skew actuator to servo track zero reference
Bui Nhan Xuan,Reed Alan Hancock,Inch Randy Clark,Kevin B. Judd,Kazuhiro Tsuruta +4 more
- 17 Feb 2010
TL;DR: In this paper, a servo detection system for detecting servo tracks of a longitudinal tape is presented, in which two servo read heads are spaced laterally on a first head module, and a read head is on a second head module spaced longitudinally from the first module.
25
Patent
Correction table creation method for head position control, head position control method and disk device
Kazuhiko Takaishi
- 09 Nov 2004
TL;DR: In this article, a filter function is generated by forming the following, i.e., sine and cosine terms of DFT and inverse DFT are collected and complex values a(m) and b(m), of the m-th RRO frequency of frequency characteristics (1+C(z)P(z)) or -((1+c(z),P)z))/P(Z)) that is to be multiplied and sine for frequency conversion are multiplied and the filter function F(x) has a filter form targeting only the frequency variation that
23
Patent
Written-in repeatable run-out compensation in embedded servo disc drives
Yi-Ping Hsin
- 12 Dec 2001
TL;DR: In this article, an apparatus and method of correcting for written-in repeatable run-out in a disc drive having a servo loop for positioning a head over a rotating disc is provided.
22
Patent
Method and apparatus for feedforward repeatable runout compensation in a selected frequency range
ShuangQuan Min,MingZhong Ding,KianKeong Ooi +2 more
- 25 Mar 2003
TL;DR: In this article, a servo feedback loop is configured to control a head position relative to a corresponding disc surface, and a feed forward controller prevents the frequency sensitivity from substantially varying the feedforward closed-loop transfer function gain and phase within the target frequency range, thus reducing computational burden.
21
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