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conference on advances in optical data storage technology

作者： Chen, CH Yen, JY Natl Taiwan Univ Dept Mech Engn Taipei 10617 Taiwan

ISBN: (纸本)0819455989

The eccentricity in the optical Disk Drive (ODD) is the inevitable deviation of the geometric center of circular tracks from the rotating center of the disk. The resulted "runout" in the drive is thus periodic with disk rotation. To overcome the runout, conventional approach is for the pick-up head to go forward to the target track while shaking with the period runout during track accessing. This paper proposes an integration of the learning algorithm to learn the runout motion with an on-line observer to estimate the track runout during track accessing. The purpose is to allow for online computation of the target track kinematics so that the controller can adjust the accessing strategy to accommodate for the target track behavior. The proposed algorithm is demonstrated to be feasible through experiments applied to the fine jump control for a general optical storage opto-mechenical-electrical-control plant from OES in ITRI.

关键词： optical disk drive runout learning algorithm fine seek

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APPLICATIONS OF A NEW LASER RECORDING MEDIA FOR optical data storage.

Proceedings of the Technical Program - Electro-Optics/Laser ...

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Proceedings of the Technical Program - Electro-Optics/Laser conference & Exposition 1979年 69-78页

作者： Drexler, Jerome

The unique performance characteristics of a new class of laser recording media which has been given the tradename DREXON are discussed. These characteristics permit the design of optical data storage products and systems incorporating modern laser technology. Special features of the media enable prerecording of control markings and replication of discs for large-scale distribution of data. The principal types of potential applications for this media are categorized and several are discussed. Additionally, the technical and economic performance of the DREXON optical memory is compared to that of magnetic discs, magnetic tape, and COM microfiche.

关键词： data storage, optical

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Write head with a micro coil for magneto-optical data storage

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IEEE TRANSACTIONS ON MAGNETICS 2004年第4期40卷 3207-3209页

作者： Ben Amor, A Ruffert, C Knappmann, S Gatzen, HH Univ Hannover Inst Microtechnol D-30167 Hannover Germany Deutsche Thomson Brandt GMBH D-78003 Villingen Schwenningen Germany

To increase storage capacity, an advanced magneto-optical recording technology using high numerical aperture (NA) optics (NA>0.8) in combination with a micro coil creating a local magnetizing field has been investigated. For data recording, a beam of blue laser light locally heats up the magneto-optical storage layer, which is then magnetized by the micro coil. The micro coil therefore needs to be located at a very small working distance (< 50 mum) from the disks, which requires the magnetic coil to be mounted between the lens and the disk. Furthermore, the substrate has to be transparent to allow the laser beam to pass through the center of the magnetizing coil. The microcoil that has been developed has proven capable of creating the magnetic field required for magneto-optical recording, could operate at the required recording frequencies, and promises sufficient heat dissipation.

关键词： magneto-optical recording micro coil thin-film technology

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Error-correction codes for optical disc storage

Error-correction codes for optical disc storage

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conference on advances in optical data storage technology

作者： Liu, X Jia, HB Ma, C Tsing Hua Univ Opt Memory Natl Engn Res Ctr Beijing 100084 Peoples R China

ISBN: (纸本)0819455989

From CD to DVD to Blu-ray Disc, that optical disc all adopted the error-correction code to improve the storage. The error-correction code for the Blu-ray Disc, the up-to-the-minute optical disc, is more advanced than others. Many new technologies are applied in the Blu-ray Disc, especial the error-correction code which called Picket code is more powerful than RS and RSPC code. In the same condition, the error-code rate of the optical disc which used the Picket code is 1.5x10(-18), and the optical disc used RSPC is 5.7x10(-7). In this paper, the characteristic of those technologies which used in the optical disc will be discussed, include RS code used in CD system, RSPC code used in DVD system, and Picket code. Finally, it will add two different error matrixes to simulate the process of the error-correction code for the DVD system. In this simulating process, especially, we will compare the RS and RSPC code from mathematical direction in the simulation which is different from the professional comparison, this method can be easily accepted by beginner and the comparative result is very intuitionistic for freshman.

关键词： ECC code optical disc storage DVD system Blu-ray Disc mathematical simulation

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Study and performance analysis of IP-based storage system

Study and performance analysis of IP-based storage system

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conference on advances in optical data storage technology

作者： Zhang, JZ Yang, B Guo, J Jia, HB Tsinghua Univ Opt Mem Natl Engn Res Ctr Beijing 100084 Peoples R China

ISBN: (纸本)0819455989

storage technology has enjoyed considerable growth since the first disk drive was introduced nearly 50 years ago. Various storage devices with large volume and high performance are emerging and they carry the important information for our social life. How to make the devices more broadly and effectively used and make the information more available is a problem for today. IP-based storage provides such a cheap interface for storage devices under the rapid development of network technology. This paper answers what is network storage relative to traditional storage and then puts emphasis on two typical IP-based storage technologies NAS and iSCSI. The article evaluates the performance of NAS and iSCSI by measuring and analyzing file-level access performance and block-level access performance. Our test results show that iSCSI provides higher performance then using NFS protocol in Linux or SMB protocol in Windows (NAS scheme). The last part of the paper gives characteristic and trade-off of several IP-based storage system architectures.

关键词： network storage NAS iSCSI SAN

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High-density, large-capacity, nonvolatile holographic storage in photorefractive crystals

High-density, large-capacity, nonvolatile holographic storag...

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conference on advances in optical data storage technology

作者： Tao, SQ Jiang, ZQ Yuan, W Wan, YH Wang, Y Liu, GQ Wang, DY Ding, XH Jia, KB Beijing Univ Technol Coll Appl Sci Beijing 100022 Peoples R China

ISBN: (纸本)0819455989

The recent research on high-density, large-capacity, nonvolatile holographic storage in photorefractive crystals, carried out at Beijing University of technology, is reviewed in this paper. A batch thermal fixing technique was developed to overcome the volatility of a large number of multiplexed holograms, which has also proved to increase the effective dynamic range of crystals, hence to increase the storage density. The key of this technique is determination of the inter-batch optical erasure time constant that is much longer than the convenient (intra-batch) erasure time constant of the crystal. Disk-type storage is proposed to increase the degree of spatial multiplexing, so that the whole volume of the material can be used for storage, and the capacity increases remarkably. Incorporating batch thermal fixing into holographic disk storage yields to a track-division thermal fixing (TDTF) scheme for holographic disk storage to overcome the volatility of information and increase the storage density and capacity as well. Analyses and experimental results on a high density of 50 bits/mu m(2) (10 Gbits/cm(3)) show that high-density huge-capacity mass storage, indicated by storing 1 tera-bits or more data in a single crystal of reasonable size, can be achieved by means of TDTF holographic disk storage scheme.

关键词： holographic storage density capacity non-volatility batch-thermal fixing dynamic range image fidelity track-division thermal fixing disk-type storage

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Three-dimensional optical storage recording by microexplosion in a doped PMMA polymer

Three-dimensional optical storage recording by microexplosio...

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conference on advances in optical data storage technology

作者： Tang, HH Jiu, HF Jiang, B Cai, JW Xing, H Zhang, QJ Huang, WH Xia, AD Univ Sci & Technol China Dept Precis Machinery & Precis Instrumentat Hefei 230026 Peoples R China

ISBN: (纸本)0819455989

Three-dimensional optical data storage realized by microexplosion based on a multi-photon absorption process is a promising method to fabricate optical read-only memory with large recording capacity. The writing of multi-layered data bits inside a PMMA block doped with rare-earth ions (Sm3+ and Ce3+) under multi-photon absorption excited by a 800nm femtosecond (fs) pulsed laser was reported. The fs pulsed laser beam was focused into the sample with a microscope objective (N.A.= 0.65 40X), and bits were recorded as structurally altered regions which have high contrast in refraction index and fluorescence intensity. The recorded bits could be retrieved parallel by transmission using a conventional optical microscope or be read out serially by fluorescence signal of the structurally altered region excited by a 514.5nm laser using a reflect-type confocal microscope. Experimental results of three-dimensional recording and reading with 4-um in-plane bit spacing and 8-um inter-plane spacing in eight layers were presented. The structure changed in the material before and after the laser irradiation was discussed.

关键词： three-dimensional optical data storage multi-photon absorption a doped PMMA polymer femtosecond laser

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Super-resolution optical mastering system using blue laser and high-numeric aperture lens

Super-resolution optical mastering system using blue laser a...

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conference on advances in optical data storage technology

作者： Fan, XD Xu, DY Qi, GS Jiang, PJ Qian, K Tsing Hua Univ Dept Precis Instruments & Mech Beijing 100084 Peoples R China

ISBN: (纸本)0819455989

A practical mastering technology was developed using a blue laser optical mastering system with a wavelength of 405 rim, a numeric aperture (NA) of 0.95 and a phase-shift apodizer. The laser is shaped and collimated by a space filter with its diameter 2 mu m, then is split into two beams by polarizing prism. One beam is used to detection of the optical power, and the other beam is used to write data on the disc. The phase-shift mask is lay between the collimating lens and the polarizing prism to optimizing the intensity distribution of Airy point on the disc. The lens with high NA 0.95 is designed to make the image point of the laser less then the diffraction point. The air-operated focus control device is used to focalize the light on the disc. Based on the technology, the recording spot with its diameter about 223nm is achieved.

关键词： mastering system super-resolution phase-shift mask

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MASS storage DEVICES KEEP PACE WITH SYSTEM NEEDS.

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Electronic Systems technology and Design/Computer Design's 1984年第11期23卷 71-74,76,78-81页

作者： Killmon, Peg Computer Design Littleton MA USA Computer Design Littleton MA USA

The paper discusses modern trends in the development of magnetic and optical mass storage devices. The state-of-the-art disk and tape systems available in the market are presented. The future advances in disk drive ma... 详细信息

关键词： data storage, MAGNETIC

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Simulating readout signals of 3D geometrical pits/lands and surface defects

Simulating readout signals of 3D geometrical pits/lands and ...

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conference on advances in optical data storage technology

作者： Liu, L Shi, ZM He, SL Zhong, GJY Zhejiang Univ Ctr Opt & Electromagnet Res State Key Lab Modern Opt Hangzhou 310027 Peoples R China

ISBN: (纸本)0819455989

Higher NA optical pick-ups (OPUs) are being applied in optical storage system for high capacity. As the vector characteristics of the laser beam in high NA OPU play an important role in the interaction between the disc information layer and laser beam, simulations based on both vector diffraction theory and rigorous calculation of Maxell's equations are becoming more and more important. They not only provide accurate and reliable simulation results, but also make it possible to investigate many other interesting topics e.g. the feasibility of using polarized light to increase storage density of optical discs. In this paper, a software package based on three-dimensional finite-difference time domain algorithm (3D-FDTD) is introduced to simulate readout signals. It can be used to simulate the reflection pattern for three dimension geometrical pits accurately. Moreover, because it can interface with optical design program ZEMAX, the simulation can be done for different light paths and in the presence of surface defects, which is very useful for analyzing and evaluating a practical OPU. The features of this software are expected to help explore new disc formats, understanding signals in servo path and data path, and furthermore designing a new optical pick-up etc.

关键词： optical storage simulation 3D FDTD vector diffraction surface defects

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