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RRO/NRRO characteristics in mobile HDDs 移动硬盘中的RRO/NRRO特性
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925375
K. Akagi
{"title":"RRO/NRRO characteristics in mobile HDDs","authors":"K. Akagi","doi":"10.1109/APMRC.2009.4925375","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925375","url":null,"abstract":"The characteristics of repeatable runout (RRO) and non-repeatable runout (NRRO) of HDDs have to be clarified for higher tracks per inch since the static positional accuracy has almost reached its limit. The most dominant component in NRRO and even in RRO is torque disturbance. We experimentally estimated that the rate of windage - the dominant component of torque disturbance - using a mixture of helium and air.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"46 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":"123319923","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
Fluid structure interaction analysis in a disk drive 磁盘驱动器流体结构相互作用分析
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925418
M. Kazemi
{"title":"Fluid structure interaction analysis in a disk drive","authors":"M. Kazemi","doi":"10.1109/APMRC.2009.4925418","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925418","url":null,"abstract":"Numerical analysis of fluid structure interaction in a disk drive verifies that a damper plate reduces aerodynamic disturbances, allowing for lower off-track vibration of read-write heads. Further analysis reveals that arm holes used for mass reduction also appear to have a detrimental effect on the flow field, with subsequent negative effects to head vibration.","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":"129978047","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
Mitigation of track following RRO in high TPI hard disk drives through servo and mechanical designs 通过伺服和机械设计降低高TPI硬盘驱动器的跟踪RRO
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925426
J. Chang
{"title":"Mitigation of track following RRO in high TPI hard disk drives through servo and mechanical designs","authors":"J. Chang","doi":"10.1109/APMRC.2009.4925426","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925426","url":null,"abstract":"Servo and mechanical approaches are presented in this paper with a view to minimize repeatable runout (RRO) component of track-following position error signal (PES) in high TPI (Track Per Inch) hard disk drives. The harmonics of the RRO are identified and catalogized in the context of real-time RRO and written-in RRO harmonics. Combination of empirical PES measurements, review of relative analytical works, and working servo and mechanical design solution methods will be systematically discussed through this paper.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"46 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":"121331611","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
Servo performance analysis and PES prediction for patterned media technology 模式介质技术伺服性能分析及PES预测
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925403
F. Hong, W. Wong, S. Zhang, J. N. Teoh
{"title":"Servo performance analysis and PES prediction for patterned media technology","authors":"F. Hong, W. Wong, S. Zhang, J. N. Teoh","doi":"10.1109/APMRC.2009.4925403","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925403","url":null,"abstract":"An integrative servo analysis platform is used to carry out simulations for a commercial drive using patterned media technology. Servo performance is compared between the conventional linear control and some advanced servo control algorithms. In addition, the effects on the PES quality due to the timing jitter on the sampling time, quantization of PES signal, and quantization of control signal are evaluated.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"12 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":"121137199","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
Optimal reset control for a hard disk drive dual-stage actuator system 硬盘驱动器双级致动器系统的最佳复位控制
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925405
Hui Li, C. Du, Youyi Wang, Yuqian Guo
{"title":"Optimal reset control for a hard disk drive dual-stage actuator system","authors":"Hui Li, C. Du, Youyi Wang, Yuqian Guo","doi":"10.1109/APMRC.2009.4925405","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925405","url":null,"abstract":"This paper presents an optimal reset control (ORC) method for a dual-stage actuator servo system (DSA) in hard disk drives (HDDs). Track seeking performance is investigated and simulation results show that the propose method is able to achieve short settling time and low overshoot.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"120 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":"122945366","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
In-situ measurement of reader gap length 现场测量读卡器间隙长度
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925401
Wenyao Wang, H. Huo, Victor Mh Tan
{"title":"In-situ measurement of reader gap length","authors":"Wenyao Wang, H. Huo, Victor Mh Tan","doi":"10.1109/APMRC.2009.4925401","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925401","url":null,"abstract":"We are presenting a technique to perform the reader-gap length in-situ measurement. It utilizes the presence of the first gap minimum on the third harmonic readback signal spectrum to calculate the electrical reader-gap length, and factor the electrical result to the physical reader-gap length. Compared with existing metrology-based methods, the measurement is non-destructive, dynamic, and insensitive against the skew angle change.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"140 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":"116438185","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
An experimental study of head-disk clearance sensitivity and instabilities in magnetic recoding heads with adaptive flying height 自适应飞行高度磁记录磁头磁盘间隙灵敏度和不稳定性的实验研究
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925400
D. Tongsomporn, K. Vongsarath, R. Sivaratana, N. Afzulpurkar, B. Bargmann, A. Siritaratiwat
{"title":"An experimental study of head-disk clearance sensitivity and instabilities in magnetic recoding heads with adaptive flying height","authors":"D. Tongsomporn, K. Vongsarath, R. Sivaratana, N. Afzulpurkar, B. Bargmann, A. Siritaratiwat","doi":"10.1109/APMRC.2009.4925400","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925400","url":null,"abstract":"We did an experimental study to examine the head-to-media spacing (HMS) sensitivity of electrical performance of perpendicular recording system with an adaptive flying height (AFH) heater. It also focused on the effect of the temperature rise due to the AFH heater on the instability and noise of tunneling magnetoresistance (TMR) sensors. It is firstly reported that the high temperature rise from the AFH heater induces head instabilities. The signatures on the transfer curve indicate that the flipping of a synthetic antiferromagnet (SAF) edge magnetization causes these instabilities. The thermal stress potentially reduces the exchange-bias field and thermal stability of SAF layers and an antiferromagnetic (AFM) layer allowing flipping the SAF edge magnetization.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"48 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":"130877417","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
Investigation of flow disturbance by disk-shroud configuration of Servo Track Writer 伺服轨迹写入器盘盖结构对流动扰动的研究
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925428
Dae-Wee Kong, Shi-Jung Kim, W. Kim, Chulwoo Lee
{"title":"Investigation of flow disturbance by disk-shroud configuration of Servo Track Writer","authors":"Dae-Wee Kong, Shi-Jung Kim, W. Kim, Chulwoo Lee","doi":"10.1109/APMRC.2009.4925428","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925428","url":null,"abstract":"The flow of air in a simplified model of a Off-line Servo Track Writer system has been investigated numerically. The study focused on the space between disks with a fixed shroud. The disk-shroud configuration is especially important in the Servo Track Writer because the flow disturbance by the rotating disks can seriously disrupt accurate electromagnetic data transfer on servo patterning. To improve the reliability and performance of a current Servo Track Writer system while providing a basis for the improved design of future device, it is necessary to advance the understanding the flow pattern by several shrouded disks configuration. The investigation of the flow disturbance by disk shrouded configuration gives advantages and disadvantages for the shroud design.","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":"130394649","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
Integration of light delivery for heat assisted magnetic recording 热辅助磁记录的光传输集成
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925427
M. Hirata, M. Oumi, M. Park, S. Tanabe, N. Chiba, L. Gonzaga, S. Yu, M. Zhang, F. Tjiptoharsono
{"title":"Integration of light delivery for heat assisted magnetic recording","authors":"M. Hirata, M. Oumi, M. Park, S. Tanabe, N. Chiba, L. Gonzaga, S. Yu, M. Zhang, F. Tjiptoharsono","doi":"10.1109/APMRC.2009.4925427","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925427","url":null,"abstract":"Light delivery with spot size converter (SSC) and optical fiber for heat assisted magnetic recording is proposed. It has an advantage in optical efficiency and integration tolerance. SSC was fabricated and confirmed its operation. Fly-ability of pico slider with optical fiber was also demonstrated.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"12 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":"114988406","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
Whole-HDD structure airflow-simulation by voxel mesh method 基于体素网格的全硬盘结构气流模拟
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925398
M. Ikegawa, H. Mukai, M. Watanabe
{"title":"Whole-HDD structure airflow-simulation by voxel mesh method","authors":"M. Ikegawa, H. Mukai, M. Watanabe","doi":"10.1109/APMRC.2009.4925398","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925398","url":null,"abstract":"Numerical fluid simulation based on the voxel mesh method was applied to the whole structure of 3.5-inch hard disk drives, and the results were compared with the experimental results obtained by a PIV (Particle Image Velocimetry) system. The results demonstrated that the velocity distributions agree well, and that this method is useful for modeling a complicated geometry such as that of hard disk drives.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"31 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":"123160127","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
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