In this work, heat assisted magnetic recording (HAMR) is simulated to assess the areal density advantages of various realistic thermal profiles. Specifically, finite element simulation and micromagnetic modeling are u...
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In this work, heat assisted magnetic recording (HAMR) is simulated to assess the areal density advantages of various realistic thermal profiles. Specifically, finite element simulation and micromagnetic modeling are used to assess the areal density consequences of a straighter thermal profile with an associated wider track. This assessment is done by simulating the thermal profiles created by heads with gapped near field optical transducers (NFTs) and split magnetic poles. By varying the gap width of the NFT and the thickness of the medium interlayer, the above variation in transition straightness and associated written transition is achieved. At specific operating points, we find that a wider track with a straighter transition results in a slightly higher recording density (1.2Tb/in(2) vs 0.9 Tb/in(2)). As expected, the former case finds its optimum at higher linear bit densities (1370 kFCI) and lower track densities (850 kTPI) than the latter case (870 kFCI and 1000 kTPI). (C) 2020 Author(s).
This paper presents an all-optical code preserving encoder and decoder. The proposed encoder and decoder serve to preserve the code in between the communication channel for enhanced security of binary data. It is desi...
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ISBN:
(纸本)9789811016783;9789811016776
This paper presents an all-optical code preserving encoder and decoder. The proposed encoder and decoder serve to preserve the code in between the communication channel for enhanced security of binary data. It is designed using the XGM effect in SOAs. The communication includes encoder and decoder simulations and results are evaluated in terms of logic received and Extinction ratio of systems. The encoder and decoder are verified to preserve the code appropriately.
The current trend in rewritable opticaldatastorage is toward the use of novel techniques to achieve densities and data rates that are superior to those achievable in hard disk magnetic recording. We will describe th...
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The current trend in rewritable opticaldatastorage is toward the use of novel techniques to achieve densities and data rates that are superior to those achievable in hard disk magnetic recording. We will describe the methodology and potential advantages/disadvantages of solid immersion lens (SIL), front-surface recording, magnetic super resolution (MSR), land & groove recording, and partial response maximum likelihood detection (PRML). We will also discuss the differences between magneto-optical and phase-change media.
Along with the rapid development of information technology such as cloud computing, Internet of Things and artificial intelligence etc., huge amount of data is growing at an explosive rate. Conventional opticaldata s...
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ISBN:
(纸本)9781510679450;9781510679443
Along with the rapid development of information technology such as cloud computing, Internet of Things and artificial intelligence etc., huge amount of data is growing at an explosive rate. Conventional opticaldatastorage (ODS) is a promising candidate for massive datastorage. It is a sustainable and green technology with the advantages of low energy consumption, high data capacity and long life-time, which once had a high expectation in the datastorage market. However, limited storage capacity is one of the main factors which prevents ODS from becoming a favorable competitor against hard disk drive (HDD), flash memory or magnetic tape. Unfortunately, the storage capacity of ODS is constrained by the optical diffraction limit. Although previously reported photoresists allow nanoscale lithography(1), they can hardly be used in nanoscale opticalstorage due to a functional deficiency of superresolution readout of the luminescent signal of the written structure. Herein, we endow photopolymerization nanolithography with AIE fluorescence characteristics, which does not destroy the existing nano-writing mechanism(2). We demonstrate nanoscale optical memory based on a photoresist film. And our nanoscale optical memory has the potential to hold as much data as a large petabyte-level HDD library.
Current datastorage techniques are based on magnetic and optical technologies such as hard drives and compact discs (CDs) respectively. Research in magnetic technologies has achieved data densities of 100 Gbits/in2 (...
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We have developed a wide-area-distributed storage system for multimedia databases that minimizes the possibility of simultaneous failure of multiple disks in the event of a major disaster. It features a RAID system wh...
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We have developed a wide-area-distributed storage system for multimedia databases that minimizes the possibility of simultaneous failure of multiple disks in the event of a major disaster. It features a RAID system whose member disks are spatially distributed over a wide area. Each node has a device that includes the controller of the RAID and the controller of the member disks controlled by other nodes. The devices in the node are connected to a computer using fiber optic cables and communicate using Fibre-Channel technology. Any computer at a node can utilize multiple devices connected by optical fibers as a single 'virtual disk'. The advantage of this system structure is that devices and fiber optic cables are shared by the computers. In this report, we first describe our proposed system and a prototype we used for testing. Then we discuss its performance, i.e., how the read and write throughputs are affected by data-access delay, the RAID level, and queuing.
iSCSI builds on SCSI command for storage and TCP/IP protocols for networking. As a new storagetechnology, VHS has advantage of huge capability and fast data transfer rate. This paper presents a detailed design, based...
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iSCSI builds on SCSI command for storage and TCP/IP protocols for networking. As a new storagetechnology, VHS has advantage of huge capability and fast data transfer rate. This paper presents a detailed design, based on Intel's network processor and embedded Linux OS, to implement embedded VHS system in which unites iSCSI and VHS technologies.
In the big data era, the necessity for large capacity, high transfer rates and long-term datastorage systems has been increased. But, the main storage media we rely on currently are magnetic technology, like hard dis...
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ISBN:
(纸本)9780960038008
In the big data era, the necessity for large capacity, high transfer rates and long-term datastorage systems has been increased. But, the main storage media we rely on currently are magnetic technology, like hard disk drives (HDD) and tape, which life times are several years only. They cannot satisfy the demand of prolonged preservation. optical discs based on the bit-by-bit method, such as CD, DVD and Blu-ray Disc, for storing sound, movies, photos and other digital contents are widely used in our daily life. The long-term life time is one of the properties. The optical disc should be a good candidate of datastorage system for big data preservation. However, the recording density limitation of the bit recording method are looming on the horizon.
In this paper, a testing method for optical polished surface in level instrumentation and supersmooth surface in soft x-ray system using Atomic Force Microscope (AFM)is presented, and some testing results reached to n...
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ISBN:
(纸本)0819437441
In this paper, a testing method for optical polished surface in level instrumentation and supersmooth surface in soft x-ray system using Atomic Force Microscope (AFM)is presented, and some testing results reached to nanometer RMS are listed. In the paper it is indicated that, different size of polished platforms are formed as difference of optical polished method and period. Important applications of AFM testing method for improving optical polished technology and obtaining supersmooth surface are introduced in the paper.
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