Novel NRRO minimization algorithm for an ultra-high-density servo track writer

Noda, Kohki; Naoe, M.

doi:10.1109/20.617429

Cited by 13 publications

(3 citation statements)

References 3 publications

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“…In order to reduce track misregistration (TMR) and achieve high track density, it is necessary to improve the positioning accuracy of servo track writer [1] and reduce the written-in error in the disk drive [2].…”

Section: Introductionmentioning

confidence: 99%

$H_2$ Control for Head Positioning in Axial and Radial Dimensions for Self-Servo Track Writing

Xie²,

Teoh³

et al. 2008

IEEE Trans. Contr. Syst. Technol.

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The self-servo track writing (SSTW) process for hard disk drives (HDDs) consists of axial (or time) and radial (or track) dimensions and is described by using a 2-D model. Within the 2-D system framework, the error propagation containment problem of the SSTW is formulated as a 2-D stabilization problem, and the position error minimization problem is formulated as a 2-D H 2 control problem. The adopted 2-D controller is designed with the easily implemented linear matrix inequality (LMI) approach. With the stored error information of the preceding track, the 2-D control scheme is realizable. The simulation results demonstrate that the error propagation is prevented by the 2-D control scheme and the positioning accuracy is remarkably improved by the 2-D H 2 control scheme. Also, servo performance is evaluated with the 1-D controller in time dimension, obtained from the designed 2-D controller.

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Section: Introductionmentioning

confidence: 99%

$H_2$ Control for Head Positioning in Axial and Radial Dimensions for Self-Servo Track Writing

Xie²,

Teoh³

et al. 2008

IEEE Trans. Contr. Syst. Technol.

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“…Servo bursts are conventionally written by costly dedicated servowriting equipment external to the disk drive, which uses a laser-guided push-pin mechanism to position write head on the disk surface until the servo burst information is written on the media of a head disk assembly (HDA) completely [1]. Recently a great deal of attention has been paid to the improvement on servo track writing [5], [8], [10], [13].…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional Control of Self-servo Track Writing for Hard Disk Drives

Xie

Teoh

et al. 2006

2006 9th International Conference on Control, Automation, Robotics and Vision

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Self-servo track writing (SSTW) process for hard disk drives (HDDs) is described by using a two-dimensional (2-D) model, with which the error propagation containment problem of the SSTW is formulated as 2-D stabilization problem, and the position error minimization problem is formulated as 2-D H2 control problem. The adopted 2-D controller is designed with easily implemented linear matrix inequality (LMI) approach. With the stored error information of previous track, the 2-D control scheme is realizable. The simulation results demonstrate that the error propagation is prevented by the 2-D control scheme and the positioning accuracy is remarkably improved by the 2-D H2 control scheme. Also, from the 2-D controller servo performance is evaluated in usually concerned 1-D sense.

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“…Furthermore, if the disk surface is divided into two separated regions~ one for each actuator, then the distance of track seeks by each actuator is reduced such that the seek time is decreased even with lower cost actuators. Thus, the dual-actuator structure has the feature of fast data access and parallel data transfer, which would improve the data transfer rate in HDDs or decrease the servo-writing time in the servo track writer (STW) [4].…”

Section: Introductionmentioning

confidence: 99%

Modeling and control design of dual-actuator system for hard disk drives

Zheng

Guo

Wang

The Fifth International Conference on Power Electronics and Drive Systems, 2003. PEDS 2003.

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The dual-actuator structure for hard disk drives (HODs) allows faster data access with relatively slower spindle speed. However, the mechanical interaction between the actuators tends to degrade the head positioning accuracy and thus decreases the track density performance.[n this paper, the dual-actuator structure is formulated as a dual-input dual-output (DIDO) model and the parameters of the model are identified by least square estimation algorithm in frequency domain. The loop shaping control designs are presented to deal with the narrow-band disturbance due to interaction generated by the other actuator doing randomseeking. Experimental results on a prototype demonstrate that the position error signal (PES) value due to interaction disturbance is reduced by 16% with a notch filter and 64% with a peak filter based on the lead-lag feedback controller.

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Novel NRRO minimization algorithm for an ultra-high-density servo track writer

Cited by 13 publications

References 3 publications

$H_2$ Control for Head Positioning in Axial and Radial Dimensions for Self-Servo Track Writing

$H_2$ Control for Head Positioning in Axial and Radial Dimensions for Self-Servo Track Writing

Two-dimensional Control of Self-servo Track Writing for Hard Disk Drives

Modeling and control design of dual-actuator system for hard disk drives

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