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Role Of Bit Patterned Media In Future Of Hard Disk Drives
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Book Synopsis Role of Bit Patterned Media in Future of Hard Disk Drives by :
Download or read book Role of Bit Patterned Media in Future of Hard Disk Drives written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The hard disk industry has traditionally stayed competitive by competing on the means of price alone by cutting down aggressively on cost via increase of areal density. Continuing increases in the areal density of hard disk drives will be limited by thermal instability of the thin film medium and is estimated to be limited to about 500Gb/in2. Patterned media, in which data are stored in an array of single.domain magnetic particles, have been suggested as a means to overcome this limitation and to enable recording densities greater than ITb/in2. However, the implementation of patterned media requires fabrication of sub-50-nm features over large areas and the design of recording systems that differ from those used in conventional hard drives. This report discusses the challenges facing patterned media, the fabrication of arrays of ́small magnetic particles and their magnetic properties. The practical implementation of patterned media recording schemes is assessed via technology estimates and cost analysis.
Book Synopsis Role of Bit Patterned Media in Future of Hard Disk Drives by : Vibin Aravindakshan
Download or read book Role of Bit Patterned Media in Future of Hard Disk Drives written by Vibin Aravindakshan and published by . This book was released on 2007 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: The hard disk industry has traditionally stayed competitive by competing on the means of price alone by cutting down aggressively on cost via increase of areal density. Continuing increases in the areal density of hard disk drives will be limited by thermal instability of the thin film medium and is estimated to be limited to about 500Gb/in2. Patterned media, in which data are stored in an array of single.domain magnetic particles, have been suggested as a means to overcome this limitation and to enable recording densities greater than ITb/in2. However, the implementation of patterned media requires fabrication of sub-50-nm features over large areas and the design of recording systems that differ from those used in conventional hard drives. This report discusses the challenges facing patterned media, the fabrication of arrays of ́small magnetic particles and their magnetic properties. The practical implementation of patterned media recording schemes is assessed via technology estimates and cost analysis.
Book Synopsis Developments in Data Storage by : S. N. Piramanayagam
Download or read book Developments in Data Storage written by S. N. Piramanayagam and published by John Wiley & Sons. This book was released on 2011-11-08 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: A timely text on the recent developments in data storage, from a materials perspective Ever-increasing amounts of data storage on hard disk have been made possible largely due to the immense technological advances in the field of data storage materials. Developments in Data Storage: Materials Perspective covers the recent progress and developments in recording technologies, including the emerging non-volatile memory, which could potentially become storage technologies of the future. Featuring contributions from experts around the globe, this book provides engineers and graduate students in materials science and electrical engineering a solid foundation for grasping the subject. The book begins with the basics of magnetism and recording technology, setting the stage for the following chapters on existing methods and related research topics. These chapters focus on perpendicular recording media to underscore the current trend of hard disk media; read sensors, with descriptions of their fundamental principles and challenges; and write head, which addresses the advanced concepts for writing data in magnetic recording. Two chapters are devoted to the highly challenging area in hard disk drives of tribology, which deals with reliability, corrosion, and wear-resistance of the head and media. Next, the book provides an overview of the emerging technologies, such as heat-assisted magnetic recording and bit-patterned media recording. Non-volatile memory has emerged as a promising alternative storage option for certain device applications; two chapters are dedicated to non-volatile memory technologies such as the phase-change and the magnetic random access memories. With a strong focus on the fundamentals along with an overview of research topics, Developments in Data Storage is an ideal reference for graduate students or beginners in the field of magnetic recording. It also serves as an invaluable reference for future storage technologies including non-volatile memories.
Book Synopsis Ultra-High-Density Magnetic Recording by : Gaspare Varvaro
Download or read book Ultra-High-Density Magnetic Recording written by Gaspare Varvaro and published by CRC Press. This book was released on 2016-03-30 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: Today magnetic recording is still the leading technology for mass data storage. Its dominant role is being reinforced by the success of cloud computing, which requires storing and managing huge amounts of data on a multitude of servers. Nonetheless, the hard-disk storage industry is presently at a crossroads as the current magnetic recording techno
Book Synopsis The STREAM TONE: The Future of Personal Computing? by : T. Gilling
Download or read book The STREAM TONE: The Future of Personal Computing? written by T. Gilling and published by Troubador Publishing Ltd. This book was released on 2017-02-13 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Personal computing is changing from an old world of local services provided by local devices to a new world of remote Web-based services provided by cloud computing-based data centres. This book explores in detail what might be required to make a comprehensive move to this exciting new world and the many benefits that move could bring.
Book Synopsis Study of Dynamics and Nanoscale Heat Transfer of Head Disk Interface in Hard Disk Drives by : Yuan Ma
Download or read book Study of Dynamics and Nanoscale Heat Transfer of Head Disk Interface in Hard Disk Drives written by Yuan Ma and published by . This book was released on 2018 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its introduction in 1956, hard disk drives have become one of the dominant products in the industry of data storage. The capacity of the hard disk drives must keep evolving to store the exploding data generated in the era of big data. This demand pushes the development of technologies including heat assisted magnetic recording (HAMR), microwave assisted magnetic recording (MAMR) and bit-patterned media (BPM) to increase the areal density beyond 1Tb/in2. In the development of these technologies, it is essential to have a clear understanding of the dynamics and nanoscale heat transfer behavior across the head-disk interface. In this dissertation, dynamics and nano-scale heat transfer in the head disk interface are discussed. Experimental study of nano-scale heat transfer is conducted with the specifically designed static touchdown experiment. Simulation strategy that incorporates the wave-based phonon conduction theory was also developed. In the flying condition, correlation between the temperature and head disk spacing was found at both passive flying stage and modulation stage. When the flying height increases due to either disk surface microwaviness or contact induced modulation, head temperature will increase, with a slight time delay, indicating the existence of a cooling effect as the head approaches the disk. The static touchdown experiment, which decouples the complicated air bearing from the nano-scale interface was further designed and performed. The heat transfer behavior across a closing nano-scale gap between head and disk was observed and measured. Experimental and simulation results showed general agreement with the theoretical predictions of the wave based theory for radiation and phonon conduction. The effect of different factors including humidity, air pressure, lubricant layer and disk substrate in the static touchdown experiment were also studied separately. Furthermore, the dynamics of HAMR condition was studied with waveguide heads. The laser induced protrusion was found to be around 1~2 nm in height. The findings of this dissertation could be applied to future HAMR head/media design, and the static touchdown experiment could be potentially improved to be a new approach to measure material conduction coefficient and emissivity with high special resolution.
Book Synopsis Ultrathin Carbon-Based Overcoats for Extremely High Density Magnetic Recording by : Reuben Jueyuan Yeo
Download or read book Ultrathin Carbon-Based Overcoats for Extremely High Density Magnetic Recording written by Reuben Jueyuan Yeo and published by Springer. This book was released on 2017-06-20 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the latest research in ultrathin carbon-based protective overcoats for high areal density magnetic data storage systems, with a particular focus on hard disk drives (HDDs) and tape drives. These findings shed new light on how the microstructure and interfacial chemistry of these sub-20 nm overcoats can be engineered at the nanoscale regime to obtain enhanced properties for wear, thermal and corrosion protection – which are critical for such applications. Readers will also be provided with fresh experimental insights into the suitability of graphene as an atomically-thin overcoat for HDD media. The easy readability of this book will appeal to a wide audience, ranging from non-specialists with a general interest in the field to scientists and industry professionals directly involved in thin film and coatings research.
Book Synopsis Numerical Investigation of the Effects of Operational Shock and Disk Surface Pattern on the Dynamics of Head Disk Interface in Hard Disk Drives by : Liping Li
Download or read book Numerical Investigation of the Effects of Operational Shock and Disk Surface Pattern on the Dynamics of Head Disk Interface in Hard Disk Drives written by Liping Li and published by . This book was released on 2013 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation investigates the effects of shock and the disk surface pattern on the head disk interface (HDI) response in hard disk drives (HDDs). A new local adaptive mesh method is proposed at the end to improve the accuracy and efficiency of the algorithm to simulate the sliders' steady flying attitudes. Over the past decades, there has been an increase in the demand of HDDs used in portable devices. In such applications, the work performance of a HDD mainly depends on its ability to withstand external disturbances. Studies of the HDD's responses and failures during external shocks can be very beneficial for improving the HDD's design. A multi-body operational shock (op-shock) model is developed for this purpose in this thesis. The Guyan reduction method is used to model all the components considered in the op-shock model (a disk, a spindle motor, a base plate, a pivot and a head actuator assembly (HAA)). A fluid dynamic bearing (FDB), between the rotating and stationary units in the spindle motor, is simplified as a spring-dashpot system to save computation efforts. The same simplification is applied to a ball bearing (BB) system between the rotating and stationary units in the actuator pivot. Then the reduced models for all the components are assembled to obtain a complete multi-body op-shock model. Four models which include different components are introduced in this thesis to investigate various components' effects on the HDD's operating performance. The HDDs' failure mechanisms are also studied. It is found that different components influence the HDI responses in different ways. The ramp load/unload (LUL) technology has been proved to be a better alternative to the contact start-stop (CSS) approach due to the advantages of increasing areal density and greater durability. However, the application of the LUL ramps in the HDDs increases the possibility of collisions between the disk and the ramps since the ramps sit closely to the disk's outer radius. Therefore, it is important to study the ramp effects on the HDD's response during a shock. A reduced model of a deformable ramp is developed and implemented to the multi-body op-shock model. Numerical analyses using three ramp models (no-ramp model, rigid ramp model and deformable ramp model) are carried out to study the HDD's failure dependence on different ramp models. Bit patterned media (BPM) recording is one of the promising techniques for future disk drives in order to increase the areal density above 4 Tbit/in2. In patterned media, an individual recorded bit is stored in a distinct magnetic island. Thus, the BPM can change the topography of the disk surface and has an effect on the flying characteristics of the air bearing sliders. Proper designs of sliders and disks in the HDDs are required in order to achieve a stable work performance. So a simulator to model a slider's flying condition over a BPM disk is particularly important. Three methods (the averaging method, the Homogenization method and the Taylor expansion Homogenization methods) are implemented to simulate a slider's flying attitude, and finally an economical accurate method is chosen (the Taylor expansion Homogenization method) to investigate the slider's dynamics on partially planarized patterned media. In modern HDDs, the requirement of small and steady head disk spacing leads to more complicated air bearing surface designs. Thus it is challenging for an air bearing simulator to accurately capture the pressure under a slider's surface. A new local adaptive grid-generating algorithm is developed and is used to simulate the sliders' steady flying attitude. Local finer meshes (mesh's dimension decreases to half) are created on the nodes of the current grids, which have pressure gradients or geometry gradients larger than a pre-defined tolerance. Two sliders are used to demonstrate the applicability of this method. It is found that this new local adaptive grid-generating method improves the stability and efficiency of the simulation scheme.
Book Synopsis Investigation of Bit Patterned Media, Thermal Flying Height Control Sliders and Heat Assisted Magnetic Recording in Hard Disk Drives by : Hao Zheng
Download or read book Investigation of Bit Patterned Media, Thermal Flying Height Control Sliders and Heat Assisted Magnetic Recording in Hard Disk Drives written by Hao Zheng and published by . This book was released on 2011 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many advanced technologies in the field of magnetic disk recording are being studied in order to achieve areal densities in excess of 1.6 gigabits per square millimeter (1 terabits per square inch). Bit patterned media (BPM) is one of these promising technologies. By using disks with physically separated magnetic patterns instead of conventional continuous media, bit patterned media avoid magnetic interference between adjacent bits and improve the thermal stability of the media. Currently, thermal flying height control (TFC) sliders are commonly used to compensate thermal effects during reading and writing and to maintain a stable and ultra-low head/disk spacing during drive operation. Heat assisted magnetic recording (HAMR) has been introduced in order to address difficulties in writing of information on magnetic media with high coercivity. By using a laser beam to locally heat the media above its Curie temperature, the magnetic material momentarily reduces its coercivity and permits writing of information on the disk. However, the method raises concerns about the stability of the lubricants on the disk. In this dissertation, we focus on the investigation of the head/disk interface for bit patterned media, the design of thermal flying height control sliders, and the implementation of heat assisted magnetic recording. In particular, we use a finite-element-based air bearing simulator to study the steady-state flying characteristics of sliders flying over bit patterned media. This air bearing simulator is then combined with a thermo-mechanical model of a slider in order to analyze thermal flying height control sliders featuring dual heater/insulator elements. Next, a finite element model of a thermal flying height control slider with an integrated heat assisted magnetic recording optical system is developed to study the effect of heat dissipation along the laser delivery path on the performance of the HAMR-TFC slider. The design parameters of the dual thermal flying height control heaters are optimized in order to minimize the dependence of the head/disk spacing on laser induced thermal effects. Finally, experimental techniques are developed to investigate the photo-thermo stability and tribological properties of HAMR-type lubricants which are designed to be resistant to the high temperatures experienced under laser exposure.
Book Synopsis Visual Inspection Technology in the Hard Disk Drive Industry by : Paisarn Muneesawang
Download or read book Visual Inspection Technology in the Hard Disk Drive Industry written by Paisarn Muneesawang and published by John Wiley & Sons. This book was released on 2015-04-13 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: A presentation of the use of computer vision systems to control manufacturing processes and product quality in the hard disk drive industry. Visual Inspection Technology in the Hard Disk Drive Industry is an application-oriented book borne out of collaborative research with the world’s leading hard disk drive companies. It covers the latest developments and important topics in computer vision technology in hard disk drive manufacturing, as well as offering a glimpse of future technologies.
Book Synopsis Holographic Data Storage by : Hans J. Coufal
Download or read book Holographic Data Storage written by Hans J. Coufal and published by Springer. This book was released on 2012-09-03 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: An outstanding reference book on an exciting topic, reaching out to the 21st century's key technologies. The editors, together with leading experts in the field from both academic research and industry, bring together the latest knowledge on this technique. The book starts with an introduction on the history and fundamentals, multiplexing methods, and noise sources. The following chapters describe in detail recording media, components, channels, platforms for demonstration, and competing technologies such as classical hard disks or optical disks. More than 700 references will make this the ultimate source of information for the years to come. The book is intended for physicists, optical engineers, and executives alike.
Book Synopsis The Physics of Ultra-High-Density Magnetic Recording by : M.L. Plumer
Download or read book The Physics of Ultra-High-Density Magnetic Recording written by M.L. Plumer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: Application-oriented book on magnetic recording, focussing on the underlying physical mechanisms that play crucial roles in medium and transducer development for high areal density disk drives.
Book Synopsis Magnetic Nanostructures in Modern Technology by : Bruno Azzerboni
Download or read book Magnetic Nanostructures in Modern Technology written by Bruno Azzerboni and published by Springer. This book was released on 2007-10-14 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, a team of outstanding scientists in the field of modern magnetic nanotechnologies illustrates the state-of-the-art in several areas of advanced magneto-electronic devices, magnetic micro-electromechanical systems and high density information storage technologies. Providing a unique source of information for the young physicist, chemist or engineer, the book also serves as a crucial reference for the expert scientist and the teacher of advanced university courses.
Book Synopsis Visions of the Future: Physics and Electronics by : J. M. T. Thompson
Download or read book Visions of the Future: Physics and Electronics written by J. M. T. Thompson and published by Cambridge University Press. This book was released on 2001-07-02 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Leading young scientists give engaging reviews of their research areas and exciting visions of future developments.
Book Synopsis Complete Computer Hardware Only by :
Download or read book Complete Computer Hardware Only written by and published by PediaPress. This book was released on with total page 475 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comprehensive Nanoscience and Nanotechnology by :
Download or read book Comprehensive Nanoscience and Nanotechnology written by and published by Academic Press. This book was released on 2019-01-02 with total page 1881 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive Nanoscience and Technology, Second Edition, Five Volume Set allows researchers to navigate a very diverse, interdisciplinary and rapidly-changing field with up-to-date, comprehensive and authoritative coverage of every aspect of modern nanoscience and nanotechnology. Presents new chapters on the latest developments in the field Covers topics not discussed to this degree of detail in other works, such as biological devices and applications of nanotechnology Compiled and written by top international authorities in the field
Book Synopsis Moving Media Storage Technologies by : Karl Paulsen
Download or read book Moving Media Storage Technologies written by Karl Paulsen and published by Taylor & Francis. This book was released on 2012-12-11 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: Complex media storage computer systems are employed by broadcasters, digital cinemas, digital signage, and other business and entertainment venues to capture, store and retrieve moving media content on systems that will preserve the original integrity of the content over time and technological transition. This book provides detailed information related to the concepts, applications, implementation and interfaces of video file servers, intelligent storage systems, media asset management services, content distribution networks, and mission critical platforms. A tutorial and case example approach is taken to facilitate a thorough understanding of the technologies, using numerous illustrations, tables and examples. The text and appendices are designed to provide easy to access valuable reference and historical information. .A focus on the media serving concepts and principles employed at the enterprise level .Practical and technological summaries of the applications and linkages between media asset management and storage technologies for studio, television, and media production workflows .Illustrations, standards, tables, and practical summaries serve as handy reference tools
