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Flexible support mechanism for hard disk drives 灵活的支持机制，硬盘驱动器
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925374
Y. Matsuda, Shigeo Nakamura, M. Sega, Y. Katou
{"title":"Flexible support mechanism for hard disk drives","authors":"Y. Matsuda, Shigeo Nakamura, M. Sega, Y. Katou","doi":"10.1109/APMRC.2009.4925374","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925374","url":null,"abstract":"A flexible support mechanism for hard-disk drives (HDDs) was devised, prototyped, and evaluated. The flexible support mechanism intercepts the external vibration of a lower frequency than its natural frequency; therefore vibration disturbance in the HDD decreased. Moreover, the resonance frequency of an HDD with a flexible support mechanism is lower than that of an HDD without the mechanism. The servo compensation ratio of HDDs is larger at a lower frequency band. The flexible support mechanism has a high interception ratio to the external disturbance in an HDD by these reasons. It is possible therefore to reduce the head-positioning error (HPE) of an HDD by applying this flexible support structure. The data-transfer rate of an HDD decreases when the HPE increases because a longer read/write time is required. Since applying a flexible support mechanism reduces the HPE, degradation of the read/write performance by vibration disturbance can be prevented. An HDD with the prototyped flexible support mechanism exhibited twice the power-proof than an HDD without the mechanism.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125283251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nitrogen doping in tetrahedral carbon and its effect on lubricant bonding 四面体碳中氮掺杂及其对润滑剂键合的影响
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925362
Yang Mingchu, Zhang Mingsheng, Zhao Jinmin, L. Bo
{"title":"Nitrogen doping in tetrahedral carbon and its effect on lubricant bonding","authors":"Yang Mingchu, Zhang Mingsheng, Zhao Jinmin, L. Bo","doi":"10.1109/APMRC.2009.4925362","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925362","url":null,"abstract":"Tetrahedral carbon (ta-C) overcoat is deposited on disk. Nitrogen is doped in ta-C and its effect on lubricant bonding is studied. The research shows that nitrogen doping content and sp3/sp2 ratio in carbon are the two key factors to affect the bonding of lubricant with carbon overcoat, the study reveals that lubricant bonding on ta-C is much different with lubricant bonding on sputtered a-C.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"184 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114141556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Automated 2D/3D scanning and evaluation of written data on spinstand 自动2D/3D扫描和评估在纺纱机上的书面数据
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925404
K. Teo, K. Chan, W. Wong
{"title":"Automated 2D/3D scanning and evaluation of written data on spinstand","authors":"K. Teo, K. Chan, W. Wong","doi":"10.1109/APMRC.2009.4925404","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925404","url":null,"abstract":"In this paper we present an automated technique of extracting the 2D readback waveforms from the spinstand especially for the evaluation of the servo pattern. The setup is tested with commercial media mounted on a Guzik spinstand. The raw readback data is acquired, processed and averaged to get the image of the servo region with high signal to noise ratio (SNR). Based on the 2D readback signal captured on the setup, the defects of the servo pattern can be identified. As compared to MFM, this is a non-destructive method, larger area signals can be acquired more quickly and conveniently, and higher SNR ratio can be obtained. This setup provides an alternative low cost solution to the media scanning function of the Guzik D5000 digital analyzer.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"192 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114860891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Contactless measurement method for HDD spindle motor parameters HDD主轴电机参数的非接触测量方法
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925376
C. S. Soh, C. Bi, Z.H. Yong, C. Lim
{"title":"Contactless measurement method for HDD spindle motor parameters","authors":"C. S. Soh, C. Bi, Z.H. Yong, C. Lim","doi":"10.1109/APMRC.2009.4925376","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925376","url":null,"abstract":"Conventional method of measuring inductance involves using a R-L-C meter. Such measurement method has limitation on accuracy due to the interference of back EMF during rotation. Profiling of the inductance at various motor positions thus requires cumbersome mechanical locking of the rotor. In this paper, an elegant method is introduced to capture inductance profile of spindle motor without the need for mechanical locking. The method involves using a DC electrical locking signal super-positioned with a pulse measuring signal to perform the measurement. The DC locking signal is then made sweep to allow micro-stepping of the motor so that inductance profile could be captured at all rotor position. The proposed method is shown to be effective, supported by derivations and experimental results","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114308839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Characteristics of slider flying considering track-seeking performance over discrete track media 考虑离散轨迹介质寻迹性能的滑块飞行特性
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925363
Ki-Hoon Kim, Yonghyun Lee, Seokhwan Kim, N. Park, Young-Pil Park, Kyoung-Su Park
{"title":"Characteristics of slider flying considering track-seeking performance over discrete track media","authors":"Ki-Hoon Kim, Yonghyun Lee, Seokhwan Kim, N. Park, Young-Pil Park, Kyoung-Su Park","doi":"10.1109/APMRC.2009.4925363","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925363","url":null,"abstract":"In this paper, we considered the effect of track-seeking performance over discrete track media. The effects of discrete track media design parameter and radial position are investigated.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116025365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design considerations for reducing shock responses of a micro-drive 减少微驱动器冲击响应的设计考虑
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925410
B. Shi, D. Shu, B. Gu
{"title":"Design considerations for reducing shock responses of a micro-drive","authors":"B. Shi, D. Shu, B. Gu","doi":"10.1109/APMRC.2009.4925410","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925410","url":null,"abstract":"Based on the operational shock simulation of the head disk assembly (HDA) of a micro-drive, we proposed three possible approaches for reducing the shock responses. These approaches are, 1) to change the Young's modulus, 2) to change the thickness of the hinge, and 3) to change the boundary condition of the disk. Numerical results show that the third approach with a clamped boundary condition for the disk produces the most significant effect on reducing the shock responses.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123086927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Vibration characteristics of hard disk drives with different internal air pressures 不同内部气压下硬盘驱动器的振动特性
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925356
Z. He, V. Venkataramanan, C. Y. Ng, E. Ong
{"title":"Vibration characteristics of hard disk drives with different internal air pressures","authors":"Z. He, V. Venkataramanan, C. Y. Ng, E. Ong","doi":"10.1109/APMRC.2009.4925356","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925356","url":null,"abstract":"Hard disk drive (HDD) performance and reliability at different environments are the interests and concerns of HDD researchers, engineers and consumers. This paper reports the experimental investigation of HDD vibration characteristics with different internal air pressures. Experiments are done by placing the HDD samples inside an altitude chamber and the vibrations are measured using a Laser Doppler vibrometer (LDV) and all-in-one (AIO) motor tester. The disk drive read/write test, vibration spectrum of actuator & suspension tip and disk flutter measurements reveal that the air pressure significantly affects the vibration behaviors of hard disk drive components and the system performances.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114064012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Numerical HDD seek acoustic transfer analysis and experimental validation 数值HDD寻求声传递分析和实验验证
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925416
F. Gao, W. Z. Lin, C. W. Lee, J. Mou, E. Ong
{"title":"Numerical HDD seek acoustic transfer analysis and experimental validation","authors":"F. Gao, W. Z. Lin, C. W. Lee, J. Mou, E. Ong","doi":"10.1109/APMRC.2009.4925416","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925416","url":null,"abstract":"A numerical seek acoustic transfer function method is developed for fast seek acoustic analysis and validated by experiments. The effects of HDD temperature and seek length on seek acoustic are also studied.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126459700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Modeling and prediction of structure-borne seek noise of HDDs hdd结构寻道噪声建模与预测
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925412
H. Zheng, J. Mou, W. Z. Lin, E. Ong
{"title":"Modeling and prediction of structure-borne seek noise of HDDs","authors":"H. Zheng, J. Mou, W. Z. Lin, E. Ong","doi":"10.1109/APMRC.2009.4925412","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925412","url":null,"abstract":"A numerical approach is presented for predicting the structure-borne seek noise in hard disk drives (HDDs) in time-domain. Rayleigh integral is adopted to relate the transient acceleration of top cover to its radiated sound pressure. A finite element modeling and simulation technique is employed to arrive at the transient vibration response, which is further used as the input for acoustic noise level calculation. The prediction results of a 1.8” HDD reveal the high dependency of structure-borne seek noise level on the current profile applied to VCM.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116941510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Flow induced slider vibration in a functional HDDI: Influence of air shroud 功能HDDI中流动诱导滑块振动:空气罩的影响
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925399
K. Sundaravadivelu, Q.D. Zhang, N. Liu, E. Ong, T. Yip, G. Chin
{"title":"Flow induced slider vibration in a functional HDDI: Influence of air shroud","authors":"K. Sundaravadivelu, Q.D. Zhang, N. Liu, E. Ong, T. Yip, G. Chin","doi":"10.1109/APMRC.2009.4925399","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925399","url":null,"abstract":"An air shroud is designed and placed within a commercially available hard disk drive operating at 15000 rpm. Turbulent air flow characteristics resulting from both the models, with and without air shroud, are compared and discussed. The wind blowing on the surfaces of the head gimbals assembly is converted into aerodynamic forces and the resulting positioning error due to off-track and out-of-plane displacements of various sliders are investigated. It is inferred the disk drive model with air shroud resulted in 21% and 40% less off-track and out-of-plane displacements respectively.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115227210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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