Relevant bibliographies by topics / Hard disk drive (HDD)

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Hard disk drive (HDD)'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Hard disk drive (HDD)"

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SUGAWARA, Nobuhiro, Katsuya HIRATA, and Jiro FUNAKI. "FLOW VISUALIZATION OF HARD DISK DRIVE." Journal of the Visualization Society of Japan 24, Supplement2 (2004): 51–54. http://dx.doi.org/10.3154/jvs.24.supplement2_51.

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Lin, Chen-Chi. "Finite Element Analysis of a Computer Hard Disk Drive Under Shock." Journal of Mechanical Design 124, no. 1 (October 1, 2000): 121–25. http://dx.doi.org/10.1115/1.1424299.

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Shock of computer hard disk drives (HDD) in both portable and desktop computers is a common problem. Shock of an HDD can occur during installing the HDD into the computer, HDD testing, HDD handling, and so forth. It is important to identify key design parameters to improve HDD shock performance. This paper presents the finite element studies of a HDD under a non-operational linear drop shock. A complete HDD model is built in ANSYS finite element package. GP commands are used to apply the preload and define the interface between the head and the disk. Shock pulses with different amplitudes and pulse widths are applied to the HDD. The minimum shock amplitude required to lift off the head from the disk is determined for different shock pulse width. Discrete Fourier Transform studies are used to identify critical frequency ranges for different shock pulse widths. The design guideline for the minimum space required between the swage plates and the disk is provided. The effects of drive base stiffness, disk thickness, actuator arm stiffness, and bearing stiffness on HDD shock performance are investigated.
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Mongkolwongrojn, Mongkol, and Kunchit Kuanoon. "Effects of Slider Geometry Change on Helium Filled HDD." Advanced Materials Research 971-973 (June 2014): 1210–13. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.1210.

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This paper describes the static characteristics of helium filled hard disk drive for a self-acting two rails flat slider gas bearing. Numerical scheme based on the finite difference with multi-grid multi-level technique were implemented for the ultra-low flying height sliders. The effect of slider geometry change in both crown and camber on flying height have been examined in this research work. The results show that the flying height change is significantly with a few nanometers change in crown and camber. The flying height of helium filled magnetic flat slider head equal to 3.5 nm at trailing edge. The spacing for helium filled hard disk drive is lower than 4 nm when compared with conventional air filled hard disk drive. The increase of slider crown, the flying height increases rapidly but the increase of slider camber, the flying height decreases continuously.
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Nebenzahl, L., R. Nagarajan, J. Wong, L. Volpe, and G. Whitney. "Chemical Integration and Contamination Control In Hard Disk Drive Manufacturing." Journal of the IEST 41, no. 5 (September 14, 1998): 31–35. http://dx.doi.org/10.17764/jiet.41.5.b3m3376867pj0232.

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As we approach the turn of the century, the demand for storage is rapidly increasing, fueled by multimedia and its associated applications. Hard disk drive (HDD) manufacturers continue to respond by chasing the areal density curve to provide higher capacity and higher performance disk drives. The required technology changes are expected to aggravate performance and reliability problems, such as stiction, associated with organic contamination; thermal asperities, associated with particulate contamination; and corrosion, associated with ionic contamination. Anticipation and proactive resolution of chemical integration and contamination control problems are key to the successful development and manufacturing of advanced HDDs. In this paper, types and sources of contamination that can impact HDD performance are described; various contamination-related problems are reviewed; and a methodology by which successful chemical integration in the hard disk drive business can be accomplished is outlined.
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Mongkolwongrojn, Mongkol, and Kunchit Kuanoon. "Theoretical Analysis of Flying Characteristics for Air-Helium Filled HDD." Advanced Materials Research 971-973 (June 2014): 844–47. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.844.

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This paper presents the flying characteristics of air-helium filled hard disk drive for a self-acting two rails flat slider bearing. Numerical scheme based on the finite difference with multi-grid multi-level technique were implemented for the ultra-low flying height sliders. The characteristics of air-helium filled HDD have been examined in this research work. The results shown that the change of flying height is significantly for various fraction of air-helium filled, at various operating conditions such as temperature velocity and mass of slider. Increase of velocity, flying height increase. Increase both the temperature and the mass load, flying height decrease. Increasing of fraction in helium gas, the flying height decreases rapidly for 40% to 60 % of fraction in helium filled. The flying height for air-helium filled magnetic flat slider head equal to 1.3 nm at trailing edge with mass load 12 mN and velocity 20 m/s. The spacing for helium filled hard disk drive is lower than 3 nm when compared with conventional air filled hard disk drive.
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Koo, Ja Choon, Sean W. Kang, Y. S. Han, and Yeon Sun Choi. "Numerical Modeling for the Characterization of Flow Excitation for the HDD Disk Vibration Control." Solid State Phenomena 110 (March 2006): 143–50. http://dx.doi.org/10.4028/www.scientific.net/ssp.110.143.

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This article presents a modeling method for air flow analysis of a hard disk drive. Air flow excitation causes disk vibration that aggravates TMR budget of the design of modern high performance hard drives. And it is the most expensive budget consumer so that controlling of the flutter becomes the primary design issue of the data storage industry. In the presented work, air flow excitation forces are characterized by LES modeling and the results are verified with experiments. A squeeze-film-type disk damper is employed in the experiments and it is applied for a hardware design improvement for disk flutter reduction. LES and RANS are compared and alternately used in a calculation in order to minimize computational efforts.
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Barbier, Charlotte, Joseph A. C. Humphrey, and Eric Maslen. "Experimental Study of the Flow in a Simulated Hard Disk Drive." Journal of Fluids Engineering 128, no. 5 (March 13, 2006): 1090–100. http://dx.doi.org/10.1115/1.2236135.

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Instantaneous circumferential and radial velocity components of the air flowing past a symmetrical pair of suspension/slider-units (SSUs) attached to an E-Block/arm were measured in a specially designed corotating disk apparatus simulating a hard disk drive (HDD) using the particle image velocimetry technique. The geometrical dimensions of the components in the apparatus test section were scaled up by a factor of two, approximately, relative to those of a nominal 312 inch HDD. Most of the measurements were obtained on the interdisk midplane for two angular orientations of the arm/SSUs: (a) One with the tip of the SSUs near the hub supporting the disks; (b) another with the tip of the SSUs near the rims of the disks. Data obtained for disk rotational speeds ranging from 250 to 3000rpm (corresponding to 1250 to 15,000rpm, approximately, in a 312 inch HDD) were post-processed to yield mean and rms values of the two velocity components and of the associated shear stress, the mean axial vorticity, and the turbulence intensity (based on the two velocity components). At the locations investigated near the arm/SSUs, and for disk rotational speeds larger than 1500rpm, the mean velocity components are found to be asymptotically independent of disk speed of rotation but their rms values appear to still be changing. At two locations 90 and 29deg, respectively, upstream of the arm/SSUs, the flow approaching this obstruction displays features that can be attributed to the three-dimensional wake generated by the obstruction. Also, between these two locations and depending on the angular orientation of the arm/SSUs, the effect of the obstruction is to induce a three-dimensional region of flow reversal adjacent to the hub. Notwithstanding, the characteristics of the flow immediately upstream and downstream of the arm/SSUs appear to be determined by local flow-structure interactions. Aside from their intrinsic fundamental value, the data serve to guide and test the development of turbulence models and numerical calculation procedures for predicting this complex class of confined rotating flows, and to inform the improved design of HDDs.
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Nasyrov, Iskandar Nailovich, Ildar Iskandarovich Nasyrov, Rustam Iskandarovich Nasyrov, and Bulat Askarovich Khairullin. "Spin Retry Count Relation with Other hdd Parameters." Journal of Computational and Theoretical Nanoscience 16, no. 12 (December 1, 2019): 5303–6. http://dx.doi.org/10.1166/jctn.2019.8603.

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The change of the SMART parameter 10 Spin retry count values depending on the operating time is considered; this parameter characterizes the number of repeated attempts to spin the disks up to operating speed if the first attempt was unsuccessful. This parameter is critical in the sense that if the value of the attribute increases, then the likelihood of malfunctions in the mechanical part of the hard disk drives is high. The scientific task of the study is to establish the relationship between this parameter in failed hard drives and the values of other reliability parameters for information stores from various manufacturers. In the course of the study, the drives of the HGST, Hitachi, Samsung, ST, Toshiba, WDC trademarks operated in the Backblaze largest commercial data centre were analysed. As a result of the analysis, the relationship between the specified parameter and such parameters as 3 Spin-up time (time of spinning the disk package from standstill to operating speed), 4 Start/stop count (counting the spindle start/stop cycles), 12 Power cycle count (number of full drive switching on/off cycles), 192 Power-off retract count (the number of shutdown cycles, including emergency), 193 Load cycle count (the number of magnetic head block moves in the parking zone/in working position cycles). It is shown that the nature of the change in the values of the considered parameters depends on the manufacturer of the hard drives. It is proposed to carry out an individual assessment of the information storage device rotation mechanism reliability using the parameters identified as a result of the study.
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Garner, Harry D., Kok-Meng Lee, and Lin Guo. "Development of a Grating Interferometer with Application to HDD Servo-Track Writing." Journal of Manufacturing Science and Engineering 123, no. 3 (April 1, 2000): 445–52. http://dx.doi.org/10.1115/1.1360694.

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The development of a grating interferometer with application to the angular measurement of a hard disk drive actuator arm for application to the servo-track writing process is presented. First, the theoretical background related to the linear type grating interferometer is presented, and this theory is extended to the measurement of the angular displacement of a hard disk drive actuator arm using a linear grating. A vector based diffraction technique has also been developed as a tool for visualization and analysis of the grating interferometer design. Finally, experimental setups and results from a prototype grating interferometer design are presented and discussed to demonstrate the feasibility of the grating interferometer measurement system.
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Thongsri, Jatuporn, and Wutthinan Suksawaeng. "Numerical Investigation of Airflow Pattern inside Environmental Chamber." Advanced Materials Research 931-932 (May 2014): 1048–52. http://dx.doi.org/10.4028/www.scientific.net/amr.931-932.1048.

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In industrial hard disk drive research and development laboratories, an environmental chamber is normally used to perform a mechanical verification test of Head Gimbal Assembly (HGA). It is very important to verify that the airflow pattern in the chamber is comparable to that in a real hard disk drive. Hence, we applied a transition shear stress transportation turbulence model (transition SST), one of the robust mathematical models in computer fluid dynamics, to simulate the airflow behavior inside both an environmental chamber and a hard disk drive (HDD). We found that, overall, the two patterns of airflow were not comparable at all. The air velocity vectors around the HGA in VENA were smaller than that in HDD. The reason for this is likely to be that there was more space between the top cover of the chamber and the platter than the space between the top cover of the hard disk drive and its platter.
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Dissertations / Theses on the topic "Hard disk drive (HDD)"

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Sládek, Petr. "Disková pole RAID a jejich budoucnost v éře SSD." Master's thesis, Vysoká škola ekonomická v Praze, 2012. http://www.nusl.cz/ntk/nusl-124667.

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The thesis aims at verification of using emerging Solid-State drives in disk arrays. The advent of SSD disks caused a small revolution in area of data storage, because the growth performance of hard drives has been slow compared to other PC components. But an entirely different principle of operation could mean compatibility problems between SSD and related technologies, such as RAID. This thesis aims at analyzing all the relevant technologies, mainly HDD, SSD and RAID. To achieve this objective, information from literature, articles and other appropriate sources will be used. Other objectives of this thesis are to determine how much are the SSDs suitable for use in the disk array, because low performance RAID controllers or different principles of operation could limit their efficiency. This question should be answered by submission of selected types of storage arrays to synthetic and practical tests of performance. The final goal is to use financial analysis of the test solutions as a shared file storage. Today, remote access to data is used by a wide range of job positions. Slow storage could mean inefficient use of working time and therefore unnecessary financial costs. The goal of my work is primarily to provide answers to the questions mentioned above. Currently it is very hard to find tests of more complex forms of disk arrays based on solid-state drives. This article can be also very useful for companies where fileservers are used to share user data. Based on the result of cost analysis, the company can then decide what type of storage is best for its purpose.
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Geier, Florian. "The differences between SSD and HDD technology regarding forensic investigations." Thesis, Linnéuniversitetet, Institutionen för datavetenskap (DV), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-44921.

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In the past years solid state disks have developed drastically and are now gaining increased popularity compared to conventional hard drives. While hard disk drives work predictable, transparent SSD routines work in the background without the user’s knowledge. This work describes the changes to the everyday life for forensic specialists; a forensic investigation includes data recovery and the gathering of a digital image of each acquired memory that provides proof of integrity through a checksum. Due to the internal routines, which cannot be stopped, checksums are falsified. Therefore the images cannot prove integrity of evidence anymore. The report proves the inconsistence of checksums of SSD and shows the differences in data recovery through high recovery rates on hard disk drives while SSD drives scored no recovery or very poor rates.
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Semati, Massimiliano. "Soluzioni per il controllo delle testine di lettura/scrittura in hard disk drive magnetici." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/11748/.

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Questa tesi descrive alcune tecniche realizzative e algoritmi di controllo per il posizionamento delle testine di lettura/scrittura in hard disk drive magnetici. Viene presentata l'attuazione a due stadi delle testine per incrementare la banda frequenziale del sistema, in cui un motore VCM funge da primo stadio e come secondo stadio si utilizza un microattuatore, di tipo piezoelettrico o elettromagnetico o elettrotermico. Il posizionamento della testina sulle tracce magnetiche dei dischi contenenti i dati si divide in due fasi: track-seeking e track-following, che presentano diversi requisiti di velocità e precisione, per questo motivo si descrive il metodo dello switching control. Successivamente viene formulato un modello matematico nello spazio degli stati degli stati dell'attuatori a due stadi e il relativo controllo in retroazione, basato su osservatore dello stato. Inoltre per il track-seeking si propone il controllo a due gradi di libertà e per il track-following il metodo del disaccoppiamento della sensitività. Infine si riportano due novità tecnologiche per gli hard disk magnetici: l'attuazione a tre stadi, che sfrutta un secondo microattuatore, di tipo termico, e gli hard disk riempiti d'elio ed ermeticamente sigillati, che semplificano il controllo grazie alla minore turbolenza del gas e al suo minor peso.
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Zhu, Xi. "High frequency CMOS integrated filters for computer hard disk drive and wireless communication systems." Thesis, University of Hertfordshire, 2008. http://hdl.handle.net/2299/2069.

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Operational transconductance amplifier and capacitor (OTA-C) filters have outstood among different types of filter due to high frequency and low power capabilities in the main stream digital CMOS technology. They have been widely used in computer hard disk drive (HDD) and wireless communication transceivers. OTA-C filters based on cascade and passive ladder simulation are well-known. However, multiple loop feedback (MLF) OTA-C filters which have certain advantages still have the scope for further research. So far there have been no explicit formulas for current-mode leapfrog (LF) filter design and performance evaluation of current-mode MLF OTA-C filters are still lacking. From application viewpoints, read channels for computer hard disk drives require very high frequency continuous-time filters. This automatically disqualifies active- RC/MOSFET-C filters and OTA-C filters become the only solution. In wireless communications, active-RC/MOSFET-C filters have been proved useful for mobile systems whose baseband frequency falls below a few MHz. However, for wireless LANs with the frequency of several tens of MHz, OTA-C filters are a strong candidate. Whilst in HDD read channels, cascaded OTA-C architectures have been most utilized and in wireless receivers, OTA-C structures based on ladder simulation have been popular, MLF OTA-C filters have not been practically used in either of the applications. This thesis describes some novel designs and applications of multiple loop feedback OTA-C filters with extensive CMOS simulations. Analogue filters for computer hard disk drive systems are first reviewed; the state of the art and design considerations are provided. Three VHF linear phase lowpass OTA-C filters are then designed, which include a seventh-order and a fifth-order current-mode filter based on the follow-the-leader-feedback (FLF) structure and a seventh-order voltage-mode filter using the inverse FLF (IFLF) configuration. These filters all have very low power consumption. The synthesis and design of general current-mode LF OTA-C filters are conducted next. Iterative design formulas for both all-pole and finite-zero functions are derived and explicit formulas for up to sixth-orders are given. These formulas are very easy to use for designing any type of characteristics. Subsequently, linear phase lowpass OTA-C filter design for HDD read channels using LF structures are investigated in details. A current-mode filter and a voltage-mode filter using the fifth-order LF structure are presented. The two filters can operate up to 800MHz and have very small passband phase ripple. Analogue filters for wireless communication baseband applications are also reviewed thoroughly in this thesis, where the design of a fourth-order current-mode FLF Butterworth lowpass OTA-C filter for multi-standard receivers is presented. Then two fifth-order current-mode elliptic lowpass OTA-C filters based on respective LF and FLF structures for wireless communication baseband are designed. Fifth-order voltage-mode IFLF and LF elliptic lowpass filters are also presented. All these MLF baseband filters designed can operate up to 40MHz to cover all important wireless and mobile standards. Simulations show that the LF structures have better dynamic range and stopband attenuation performances than the FLF and IFLF configurations.
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Embry, Bruce A. "Finding alternatives to the hard disk drive for virtual memory /." Diss., CLICK HERE for online access, 2009. http://contentdm.lib.byu.edu/ETD/image/etd2985.pdf.

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Embry, Bruce Albert. "Finding Alternatives to the Hard Disk Drive for Virtual Memory." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/1727.

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Current computer systems fill the demand of operating systems and applications for ever greater amounts of random access memory by paging the least recently used data to the hard disk drive. This paging process is called "virtual memory," to indicate that the hard disk drive is used to create the illusion that the computer has more random access memory than it actually has. Unfortunately, the fastest hard disk drives are over five orders of magnitude slower than the DRAM they are emulating. When the demand for memory increases to the point that processes are being continually saved to disk and then retrieved again, a process called "thrashing" occurs, and the performance of the entire computer system plummets. This thesis sought to find alternatives for home and small business computer users to the hard disk drive for virtual memory which would not suffer from the same long delays. Virtual memory is especially important for older computers, which often are limited by their motherboards, their processors and their power supplies to a relatively small amount of random access memory. Thus, this thesis was focused on improving the performance of older computers by replacing the hard disk drive with faster technologies for the virtual memory. Of the different technologies considered, flash memory was selected because of its low power requirements, its ready availability, its relatively low cost and its significantly faster random access times. Two devices were evaluated on a system with a 512MB of RAM, a Pentium 4 processor and a SATA hard disk drive. Theoretical models and a simulator were developed, and physical performance measurements were taken. Flash memory was not shown to be significantly faster than the hard disk drive in virtual memory applications.
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Wu, Xiaohua Sherry. "Innovation incentives and competition in the hard disk drive industry." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/69479.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Economics, 2011.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 52-53).
Firms in the hard disk drive industry are continually engaging in R & D and improving the quality of their products. We explore various determinants of the product innovation incentives for firms concerned with both their static and expected future profitability. We estimate the observed innovation outcomes as a function of market condition variables which have significant impact on innovation decisions. In addition, we estimate logit utilities that describe the marginal willingness to pay for quality improvements. One aspect of utility is that the willingness to pay for faster access time to data may be initially low but increases over time. The firms' decisions to introduce faster access time are partly motivated by dynamic considerations.
by Xiaohua Sherry Wu.
S.M.
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Ray, William H. (William Hamilton). "The reduction of acoustic noise emissions from a hard disk drive." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/34324.

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Yasuda, Takeo. "Circuit Technologies for High Performance Hard Disk Drive Data Channel LSI." 京都大学 (Kyoto University), 2001. http://hdl.handle.net/2433/150621.

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Wallberg, John Leonard. "A digital phase-locked loop for hard disk drive read channel appliations." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/42726.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
Includes bibliographical references (p. 78).
by John Leonard Wallberg.
M.Eng.
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Books on the topic "Hard disk drive (HDD)"

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Asia-Pacific Magnetic Recording Conference (3rd 2000 Tokyo, Japan). Digests of APMRC2000: On mechanical and manufacturing aspects of HDD : November 6-8, Kokuyo Hall, Tokyo, Japan. Piscataway, N.J: IEEE, 2000.

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1958-, Lee Tong Heng, and Venkatakrishnan V, eds. Hard disk drive servo systems. London: Springer, 2002.

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Chen, Ben M., Tong H. Lee, and Venkatakrishnan Venkataramanan. Hard Disk Drive Servo Systems. London: Springer London, 2002. http://dx.doi.org/10.1007/978-1-4471-3712-2.

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Alting-Mees, Adrian. The hard drive encyclopedia: The guide to PC compatible hard drives. [San Diego, CA]: Annabooks, 1991.

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Muneesawang, Paisarn, and Suchart Yammen, eds. Visual Inspection Technology in the Hard Disk Drive Industry. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119058755.

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Sweeney, George. Sustainable competitive advantage in the hard disk drive industry: A review of challenges and strategies. [S.l: The Author], 1999.

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F, Doner Richard, and Haggard Stephan, eds. From Silicon Valley to Singapore: Location and competitive advantage in the hard disk drive industry. Stanford, Calif: Stanford University Press, 2000.

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Brant, Bob. Upgrade your Macintosh and save a bundle. Blue Ridge Summit, PA: Windcrest, 1991.

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Chilton's guide to Macintosh repair and maintenance. Radnor, Pa: Chilton Book Co., 1986.

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Singapore), Asia Pacific Magnetic Recording Conference (1st 1995. The first Asia Pacific Magnetic Recording Conference 1995 (APMRC'95) on mechanical aspects of hard disk drive technology, Singapore, November 29 - December 1, 1995. New York: IEEE, 1996.

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Book chapters on the topic "Hard disk drive (HDD)"

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Weik, Martin H. "hard-disk drive." In Computer Science and Communications Dictionary, 709. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_8209.

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Gupta, Vineet. "Hard Disk Drive (Box Level)." In Encyclopedia of Tribology, 1611–15. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_1108.

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Chen, Ben M., Tong H. Lee, and Venkatakrishnan Venkataramanan. "Introduction and Preview." In Hard Disk Drive Servo Systems, 1–14. London: Springer London, 2002. http://dx.doi.org/10.1007/978-1-4471-3712-2_1.

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Chen, Ben M., Tong H. Lee, and Venkatakrishnan Venkataramanan. "Resonance and Disturbance Rejection." In Hard Disk Drive Servo Systems, 251–58. London: Springer London, 2002. http://dx.doi.org/10.1007/978-1-4471-3712-2_10.

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Chen, Ben M., Tong H. Lee, and Venkatakrishnan Venkataramanan. "System Identification Techniques." In Hard Disk Drive Servo Systems, 15–27. London: Springer London, 2002. http://dx.doi.org/10.1007/978-1-4471-3712-2_2.

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Chen, Ben M., Tong H. Lee, and Venkatakrishnan Venkataramanan. "Linear System Tools." In Hard Disk Drive Servo Systems, 29–55. London: Springer London, 2002. http://dx.doi.org/10.1007/978-1-4471-3712-2_3.

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Chen, Ben M., Tong H. Lee, and Venkatakrishnan Venkataramanan. "Linear Control Techniques." In Hard Disk Drive Servo Systems, 57–119. London: Springer London, 2002. http://dx.doi.org/10.1007/978-1-4471-3712-2_4.

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Chen, Ben M., Tong H. Lee, and Venkatakrishnan Venkataramanan. "Nonlinear Control Techniques." In Hard Disk Drive Servo Systems, 121–67. London: Springer London, 2002. http://dx.doi.org/10.1007/978-1-4471-3712-2_5.

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Chen, Ben M., Tong H. Lee, and Venkatakrishnan Venkataramanan. "Track Following of a Single-Stage Actuator." In Hard Disk Drive Servo Systems, 169–82. London: Springer London, 2002. http://dx.doi.org/10.1007/978-1-4471-3712-2_6.

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Chen, Ben M., Tong H. Lee, and Venkatakrishnan Venkataramanan. "Single-Stage Actuated Servo Systems." In Hard Disk Drive Servo Systems, 183–201. London: Springer London, 2002. http://dx.doi.org/10.1007/978-1-4471-3712-2_7.

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Conference papers on the topic "Hard disk drive (HDD)"

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Hirono, Yoshiyuki, Makoto Oono, Masahiko Sega, Shin Nagahiro, Toshihiro Arisaka, and Jirou Kaneko. "Antiflow-Induced Vibration Structure in Hard Disk Drive." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93956.

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To meet market demand for the high data density on the disk of a hard disk drive (HDD), reduction of disturbance causing track misregistration is needed. The main disturbance in HDDs in a server or a desktop PC is flow-induced vibrations caused by airflow due to the disk rotation. Generally, there are two kind of flow-induced vibration (FIV) of the structures inside a HDD. One is in-plane or out of plane vibration of the read/write component, i.e., the carriage. Another is out of plane vibration of the disk. In these experiments, we tried to reduce out of plane vibration of the disk and the carriage by making a simple structural change. The investigation is carried out to clear up a cause of FIV of the carriage. The result showed that the outflow from the disk region is strong and can be the cause of the out of plane vibration of both the disk and carriage. To counteract this fluid force, the plates were put against the disks to prevent wind disturbance. As a result, the flow-induced vibrations of the carriage and the disks were significantly reduced. Based on our results, we designed an anti-FIV structure.
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Mou, J. Q., Q. D. Zhang, K. Sundaravadivelu, N. Y. Liu, and E. H. Ong. "Reduction of Flow Induced Vibration in Hard Disk Drive." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37649.

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In this paper, system level analysis is carried out for a functional HDD with two disks and four sliders operating at spindle speed of 15000 rpm. Full numerical models both for computational fluid dynamics (CFD) analysis and structural Finite Element Analysis (FEA) are developed. The flow induced vibrations of the sliders in all three directions, namely, off-track (X), down-track (Y) and out-of-plane direction (Z) are examined respectively. The numerical simulation results are compared and validated with the experimental results measured with a 3D laser Doppler vibrometer (LDV). Good agreements are observed for the vibrations in the three directions. The airflow patterns and characteristics of the flow induced vibration in HDD for three critical positions of the head gimbal assembly (HGA) parked at the disks identified as ID, MD and OD are investigated. The results reveal that the first slider from top has the highest flow induced vibrations in all the three directions due to the higher turbulent flow close to the top disk surface. Moreover, the results indicate that the slider vibration is interacted with the disk flutter in the HDD. Optimal designs of the HDD disk and air shroud are carried out to reduce the flow induced vibration of the slider, by suppressing the disk flutter and improving the turbulent flow in the HDD. It is demonstrated that significant reduction of flow induced slider vibration could be achieved with the optimal designs of the HDD.
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Yang, Jiaping, Cheng Peng Tan, and Eng Hong Ong. "Heat Transfer Enhancement by Helium Gas Filled in a Hard Disk Drive Enclosure." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37622.

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Heat transfer issue has become a challenging task in designing a high power density data center. As power consumption (Watts) of the data center continues to increase, effective thermal management of computing clusters, servers and data storage systems in data center will become more and more demanding. Hard disk drive (HDD) as a key power consumption device in high-end data storage system, its heat transfer issue has attracted more research attentions due to its complexity in nature of enclosure air flow driven by spinning disks. Among various thermal management solutions, one promising approach is to enclose helium rather than air in the hermetically-sealed hard disk drive as to reduce windage loss and flow disturbance. This paper investigates the thermal performances of disk drives where their enclosures have been filled up with helium and various helium-air gas mixtures using FEM simulations and experimental validations. Windage loss and heat convection of the disk drives being filled up with helium or helium-air mixtures are compared and analysed. The results show that helium-filled HDD provides heat transfer enhancement capability than the air-filled HDD by achieving up to 41% reduction of average temperature rise. Furthermore, 40% reduction of magnetic transducer position error signals (PES) was experimentally observed in helium filled HDD. Enhancing heat transfer and better PES quality via helium gas will greatly improve HDD read/write reliability and increase track density capability for data storage systems in data center.
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Zhang, Shou-Mo, Cuong-C. Vu, Qun-Yang Li, Norio Tagawa, and Quan-Shui Zheng. "Superlubricity Relevant in Hard Disk Drive Applications." In ASME 2016 Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/isps2016-9523.

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Reduction of head-media spacing (HMS) keeps crucial during the increase of areal density of hard disk drives (HDD). The design of hard disk drive with a superlubric interface is reported with two schemes for HDI design to realize superlubricity. For the first scheme, the DLC layer is kept on the disk while removing the lubricant layer. The DLC layer on the transducer is replaced by graphene-like layer. The direct contact between head and disk could reduce the HMS to about 2.3 nm. For the second scheme, the DLC layer on disk is further replaced by graphene and the HMS could be reduced to below 1 nm. For the first scheme, the basic proof of concept experiments are conducted using micro-scale graphite island samples. Ultralow COF, with the average of 0.0344 on the interface of single crystalline graphite surface and DLC substrate is demonstrated by AFM. What’s more, the temperature dependence of friction between single crystalline graphite and DLC is measured by micro-force sensor mounted on micro-manipulator. The results show that heating helps to significantly decrease the friction. Desorption of contaminants along the interface is speculated to be the key mechanism for temperature dependence of friction. This work provides the concept of large-scale superlubricity relevant in HDD applications, which could be a promising technology to ultimately reduce HMS for future HDI development.
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Yu, Shengkai, Jianqiang Mou, Wei Hua, Weidong Zhou, and Chye Chin Tan. "Operational Shock Response of Ultrathin Hard Disk Drives." In ASME 2014 Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/isps2014-6962.

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Operational shock is one of key challenges for designing the ultrathin mobile hard disk drives (HDDs) due to the reduced thickness of mechanical components and their stiffness. Some simplifications in the conventional methods for operational shock simulation are not valid. In this paper, a method for system level modelling and simulation of operational shock response of HDDs has been proposed by coupling the structural finite element model of the HDD and the air bearing model. The dynamic shock response of the head-disk system in a 5 mm ultrathin HDD design is investigated. The effects of drive base stiffness, disk-ramp contact, disk spinning and disk distortion have been studied. The results reveal that the drive base deformation and ramp contact are critical for the operational shock resistance performance of ultrathin drives.
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Yang, J. P., C. P. H. Tan, and E. H. Ong. "Enhancement of Hard Disk Drive Heat Dissipations With Integrated Cooling Devices." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-69115.

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Thermal management has become a significant issue to be considered whilst designing high performance and high reliable hard disk drives (HDD). This paper proposes a compact ultra-thin cooling device for enhancing heat dissipation of HDD. The miniature device was designed and prototyped to its optimal cooling efficiency according to the thermal characteristics of operating HDD. The experimental results of this newly developed device show that it can offer up to 35% enhancement of heat dissipation with a lower power consumption of 10 mW. Furthermore, the low power consumption device has been fully integrated with the disk drive without modifying the structure of the disk drive. This device provides a key for the design engineers in developing reliable and longer operational life hard disk drives.
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Frank, Paul, and Roger Wood. "A Perspective on the Future of Hard Disk Drive (HDD) Technology." In 2006 Asia-Pacific Magnetic Recording Conference. IEEE, 2006. http://dx.doi.org/10.1109/apmrc.2006.365887.

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Rai, Rahul, and David B. Bogy. "Analysis of Off-Track Slider Vibrations in a Laptop Hard Disk Drive." In ASME/STLE 2011 International Joint Tribology Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ijtc2011-61167.

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Over the past decade there has been a significant increase the demand of hard disk drives (HDD) for the mobile platforms. In such applications, a mobile HDD is often subjected to harsh working environment. For example, components like DVD drive and built-in speakers present in a laptop can excite its HDD and hence can degrade its read/write (R/W) performance. In this study, we develope a complete model for a mobile HDD to analyze and characterize its vibration performance due to external disturbances. The current model includes a spinning disk, a fluid dynamic bearing (FDB) based spindle motor, a base plate, an actuator assembly (E-block and suspension) and a detailed model for the air bearing slider. Prediction of slider dynamics during an excitation essentially requires the solution of coupled fluid-structure problem in which head gimbal assembly (HGA) is coupled with the disk-support system through the air bearing. Off-track displacement of the slider is used to quantify the vibration performance of the HDD for excitation of different frequencies and orientations. It is observed that during an excitation, the sway modes of the actuator assembly provide the most significant contribution to the off-track vibration. This knowledge about the vibration characteristics of mobile drive can be used to design better a vibration isolation system for mounting a HDD in a laptop.
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Rai, Rahul, and David B. Bogy. "Effect of Spinning Disk–Parking Ramp Collison on the Operational Shock Performance of a Mobile Hard Disk Drive." In STLE/ASME 2010 International Joint Tribology Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ijtc2010-41149.

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With the introduction of netbook computers two years ago, the demand for hard disk drives (HDD) for mobile applications has greatly increased. High shock resistance is an important requirement for the reliable performance of HDDs in such applications. In this paper we conduct a numerical investigation to understand the failure mechanism of the head disk interface (HDI) during an operational shock. Simulation results suggest that the excitation frequency spectrum has a strong influence on HDI failure. We also investigate the effect of the parking or load unload (LUL) ramp on shock resistance using a new spinning disk model. The results suggest that asymmetric excitations induced by ramp-disk collision causes failure of the HDI at lower shock magnitudes. This study can be helpful in improving the design of HDD components and air bearing sliders (ABS) for better shock performance.
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Huang, Lidu, Kenzi Suzuki, Fu-Ying Huang, Toshiki Hirano, and Barry Stipe. "HAMR HDD Shock Responses." In ASME 2013 Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/isps2013-2896.

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Heat assisted magnetic recording (HAMR) and slim mobile hard disk drives (HDD) are being developed parallelly to maintain cost advantage over the solid state drive (SSD). Operational shock and non-operational shock capabilities are seriously challenged for the slim HDDs due to reduced stiffness (thickness). It is worse for slim HAMR drives due to additional laser diode (LD) and other necessities being added on slider. Shock tests are part of the key performance matrices that must be passed in HDD reliability tests, and the concerns for HAMR mobile drives are, 1) slider lift-off G-level degradation during op-shock, and 2) LD back-to-back hitting during non-operational shock. We studied a few potential HAMR HGA designs, also analyzed a design that improves drive op-shock performances.
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Reports on the topic "Hard disk drive (HDD)"

1

Liu, Ke, Song Jiang, and Kei Davis. Hard Disk/Solid State Drive Synergy in Support of Data-Intensive Computing. Office of Scientific and Technical Information (OSTI), July 2012. http://dx.doi.org/10.2172/1047078.

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Roberts, Thomas, and Jonathan Harter. Development and Operation of a High Throughput Computer Hard Disk Drive Recycling Enterprise. Office of Scientific and Technical Information (OSTI), November 2019. http://dx.doi.org/10.2172/1606869.

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