Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 31 for “"hard-disk drives"”.
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Role of bit patterned media in future of hard disk drives
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 …
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Temperature Dependent Robust Control Of Hard Disk Drives Using Parameter Varying Techniques
A hard disk drive (HDD) is a device that stores digital data by writing and reading magnetic signals onto a disk using a magnetic transducer. The data is organized into circular tracks that are less than 100 nm wide. Modern HDDs use a dual-state actuator to position the transducer onto these …
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Nanotribology and Nanomechanics Including Nanomechanical Properties, Adhesion and Surface Roughness With Application to Magnetic Storage Hard Disk Drives
… impact-induced contact damage of Head Disk Interfaces during operational shock. A contact mechanics based analysis with consideration of mechanical properties and thickness of various sub-micron thick surface layers, effect of adhesion, effect of roughness and flash temperature was …
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Dynamic and quasi-static contact and scratch analysis of micro-nanoscale thin solid films with application to magnetic storage hard disk drives
… contact and scratch of the slider and disk in magnetic storage hard disk drives (HDD). Similar contact problems are encountered during the operation of other micromechanical systems like RF-MEMS switches where surface damage is observed after cyclic contact. One of the most critical …
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Nanoscale interface mechanics with application to magnetic storage
… spacing between the magnetic layer of the disk and the recording elements, which, in commercial hard disk drives, is of the order of few nanometers. Achieving this goal entails the understanding of the physics at the head-disk interface and being able to reliably predict system performance …
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Technology strategy for the semiconductor memory market
… memories. SSDs store data electronically unlike hard disk drives, which store data magnetically. The advantages of a solid-state drive are: no mechanical parts, less power and weight than hard disk drives. This thesis investigates existing technologies, markets, emerging technologies, and …
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Joint Equalization and Decoding via Convex Optimization
… (LDPC) codes on finite-state channels (FSCs). Hard-disk drives (or magnetic recording systems), where the required error rate (after decoding) is too low to be verifiable by simulation, are most important applications of this research. Recently, LDPC codes have attracted a lot of attention in …
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Understanding Storage System Problems and Diagnosing Them Through Log Analysis
… over 90% new information produced are stored on hard disk drives. The explosion of data is making storage system a strategic investment priority in the enterprise world. The revenue created by storage system industry steadily increases from $14.2 Billion in 2004 to over $18.4 Billion in 2007. As …
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Regulation in Switched Bimodal Linear Systems
… head flying height regulation problem in hard disk drives, where the close proximity of the read/write head to the disk surface results in intermittent contact between the two and a bimodal system behavior, this thesis studies the output regulation problem in switched bimodal linear …
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Disturbance attenuation with multi-sensing servo systems for high density storage devices
… recording demonstrations for future HDDs (Hard-Disk Drives) are projected to exceed 500,000 TPI (Tracks-Per-Inch) in the year 2007 and are still increasing. However due to the renowned superparamagnetic limitation in magnetic recording physics, data storage industries are also looking into …
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Unexpected Universality in Disordered Systems and Modeling Perpendicular Recording Media
In state-of-the-art storage applications such as hard disk drives, the intrinsic switching field distribution of the media grains is one of the most crucial properties defining the recording quality. However, this piece of microscopic information is very hard to measure macroscopically, especially …
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Recycling of Rare Earth Magnets with Sulfur Based Chemistries and High Temperature Processing
… essential technologies, from wind turbines to hard disk drives. The production of the rare earth metal for these magnets currently involves significant greenhouse gas emissions and other environmental impacts. Additionally, the production of these metals is geographically complicated, as over …
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Study of microwave-assisted magnetization dynamics in magnetic films and structures
… recording scheme to extend areal densities in hard disk drives beyond 1 Tb/in<sup>2</sup>. In this thesis, microwave-assisted magnetization dynamics have been characterized in different spatial regimes by electrical and optical techniques to understand their influence on reversal processes. …
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Design of a permanent magnet generator for a sustainable wind energy capture and storage system
… uses permanent magnets (PMs) from discarded hard disk drives (HDDs). The PM configuration inherently produces a non-uniform air gap flux-density distribution and the pole pitches of the PMs are relatively small. This would result to an unbalanced generator output and a number of stator …
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An analytic solution for magnetization distribution in multigrain ferromagnetic materials in an applied magnetic field
… boundaries in CoCrTa films, which are used in hard disk drives. In this paper, we model the case of two adjacent semi-infinite grains with arbitrary crystalline orientations with respect to each other. A Gaussian distribution is used to model the change in magnetic properties at the interface, …
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Thin optic surface analysis for high resolution X-ray telescopes
… precision optics used in flat panel displays, hard disk drives, and x-ray telescopes. Methods for manufacturing glass sheets and further sheet shaping processes are covered. Future generation, high resolution x-ray telescopes require thin optics with large surface area to thickness ratio and a …
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The Multi-tiered Future of Storage: Understanding Cost and Performance Trade-offs in Modern Storage Systems
In the last decade, the landscape of storage hardware and software has changed considerably. Storage hardware has diversified from hard disk drives and solid state drives to include persistent memory (PMEM) devices such as phase change memory (PCM) and Flash-backed DRAM. On the software side, the …
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Fluid dynamics of thin films in semiconductor manufacturing processes
… improve the performance of LEDs, solar cells, hard disk drives, laser diodes, and displays. This improvement comes from fabricating nanostructures inside or on the surface of a substrate. Fabrication of these nanostructures often involves the coating and imprinting of thin films onto a …
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Low-temperature magnetic force microscopy with a simple design: analyzing the magnetic domains of a simple hard disk drive
… investigation on a simple memory storage disk. Scanning probe microscopy (SPM) was first developed to study various electronic properties of different materials, such as imaging high T [subscript c] superconductors. Soon after, the SPM grew and expanded in terms of techniques and …
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Active Control Of Noise Radiated From Personal Computers
… become noisier due to the increased use of fans. Hard disk drives also contribute to the annoying noise radiated by personal computers, creating a need for the control of computer noise. Due to size constraints, the implementation of passive noise control techniques in PC is difficult. …
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