A Survey of Control Issues in Optical Data Storage Systems

Kim, Kyung-Soo; Lee, Seung-Hi; Chung, Chung Choo

doi:10.3182/20110828-6-it-1002.03364

Cited by 11 publications

(12 citation statements)

References 85 publications

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“…Therefore, NFR will not be achieved until the issue of flying height control is successfully addressed. [3,4] Considering the proven technique of flying slider application in hard disk drives (HDD), which can effectively eliminate the collision phenomenon, in this article a hybrid actuator system combining the traditional voice coil actuator with the flying slider technology is studied. [5,6] As the optical disk rotates, the flying slider relies on an air bearing surface (ABS) with positive and negative pressure pockets to build up the air pressure on which the slider floats.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Head-Disk Interface Modeling and Adaptive Control of a Hybrid Actuator for Optical Data Storage Systems

Wang

et al. 2014

International Journal of Optomechatronics

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In the near-field recording (NFR) system, the gap between the lens and disk will drop down to 100 nm. However, the disk vibration and force disturbance make it difficult to maintain the desired flying height during disk operation, and the lens-disk collision can easily occur. It is proposed in this article to design a hybrid actuator system which combines both advantages of the flying slider used in hard disk drives and the voice coil actuator used in optical disk drives. The dynamic head-disk interface model of the hybrid actuator is first developed, then an adaptive regulation approach is proposed to control the flying height at its desired value despite the unknown disturbances. Simulation and experimental results are presented to illustrate the effectiveness of the proposed flying height control approach.

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Section: Introductionmentioning

confidence: 99%

Dynamic Head-Disk Interface Modeling and Adaptive Control of a Hybrid Actuator for Optical Data Storage Systems

Wang

et al. 2014

International Journal of Optomechatronics

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“…The typical architecture of an ODD and the general design of a servo system for reading data from a disk are summarized in [130]. For CD drives, these functions are well described in [115].…”

Section: ) Servo Loopsmentioning

confidence: 99%

“…A summary of fault detection and shock disturbance compensation methods is presented in [130]. A comprehensive study on surface defects can be found in [167] and [168].…”

Section: ) Focus Servomentioning

confidence: 99%

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Control Methods in Data-Storage Systems

Cherubini

Chung

Messner

et al. 2012

IEEE Trans. Contr. Syst. Technol.

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Abstract-The recording performance of data-storage devices, in which write/read elements move relative to a storage medium to reliably store and retrieve information, depends on the capability of servo mechanisms to provide the necessary positioning accuracy. The desired characteristics of servo mechanisms for datastorage systems include robustness against variations of environmental parameters, high resolution, accuracy, stability, and fast response. This paper presents a comprehensive overview of advanced servo-control methods for data storage. The applications are to well-established recording technologies, including magnetic tape and magnetic disk systems as well as CD/DVD/Blue-Ray optical data-storage systems. Moreover, newer holographic and nearfield optical systems and the emerging probe-storage technology are also addressed. Emphasis is given to the potential exhibited by the technologies considered for achieving ultra-high storage capacity, as required by the exploding demand in data-storage capacity for archival systems and massive multimedia data storage.Index Terms-Control systems, hard-disk drive, holographic data storage, optical-disk drive, scanning-probe data storage, servomechanism, tape drive.

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“…A vibration model for an optical pickup is commonly substituted with the mechanical dynamics of an objective lens actuator using a frequency response function, which is represented as the ratio of the displacement of the objective lens to the current applied to the coils (Kim et al, 2011 andCherubini et. al., 2012), referred to as HA ( f ).…”

Section: Causes Of Beam Spot Deviation On Data Planementioning

confidence: 99%

Analysis of beam spot deviation considering vibration of components in optical pickup

Ochi

Kimura

Satake

2018

Mechanical Engineering Journal

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An optical disc drive uses an optical pickup to read and write data by focusing a laser beam on the data plane of a rotating disc. The pickup is required to keep the beam spot on the current track. The latest trend of replacing metal pickup housing with plastic easily excites elastic deformation modes of the pickup housing. Optical components mounted on the housing are vibrated at the mode frequencies of the housing as well. These vibrations tilt the incident angle of a laser beam entering the objective lens and results in the displacement of the beam spot on the data plane. Our purpose in this paper is to improve the accuracy of a vibration model for optical pickups by considering the effect of the elastic deformation modes of the housing in addition to the commonly used mechanical dynamics of an objective lens actuator in order to predict stability in a tracking servo system. The effect of the elastic deformation modes of the housing was formularized as the incident angle deviation and was calculated by adding and subtracting the products of a ray transfer matrix chain representing the transfer from each optical component to the objective lens with its small displacement and tilt vector. This new vibration model reproduced an increased gain around a frequency of 20 kHz in the measured open-loop transfer function of the tracking servo system with 4% error in frequency, which was entirely unexpected in the context of existing vibration models for optical pickups. The calculated results also identified the most influential vibration modes of the housing and estimated the effectiveness of stiffening the housing with 17% error.

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A Survey of Control Issues in Optical Data Storage Systems

Cited by 11 publications

References 85 publications

Dynamic Head-Disk Interface Modeling and Adaptive Control of a Hybrid Actuator for Optical Data Storage Systems

Dynamic Head-Disk Interface Modeling and Adaptive Control of a Hybrid Actuator for Optical Data Storage Systems

Control Methods in Data-Storage Systems

Analysis of beam spot deviation considering vibration of components in optical pickup

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