Pub Date : 2004-08-16DOI: 10.1109/APMRC.2004.1521958
T. Hirai
We developed specifications for a new type of removable storage medium called an "information versatile disk for removable usage" (iVDRtrade). The objects of these specifications range from the physical layer to application layer in order to achieve the interoperability among various appliances. This paper describes a security architecture to control content utilization, a logical format based on the DDF file system, and an interface protocol applicable for AT-Attachment. The interface protocol conforms to the architecture and the format and is based on the public key infrastructure (PK1). It is applicable to systems based on Superdistribution
{"title":"Overview of content protection technology for a novel removable drive","authors":"T. Hirai","doi":"10.1109/APMRC.2004.1521958","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521958","url":null,"abstract":"We developed specifications for a new type of removable storage medium called an \"information versatile disk for removable usage\" (iVDRtrade). The objects of these specifications range from the physical layer to application layer in order to achieve the interoperability among various appliances. This paper describes a security architecture to control content utilization, a logical format based on the DDF file system, and an interface protocol applicable for AT-Attachment. The interface protocol conforms to the architecture and the format and is based on the public key infrastructure (PK1). It is applicable to systems based on Superdistribution","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122804676","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}
Pub Date : 2004-08-16DOI: 10.1109/APMRC.2004.1521951
H. Takahashi, Y. Kojima, T. Kanemura, S. Nakamura
Taguchi method was applied for designing head suspension assembly for mobile hard disk drives (HDDs). Operational shock resistance and positioning accuracy are very important. Control factors of suspension shape were selected and shock resistance and frequency response analysis by finite element method (FEM) simulation were conducted for L18 orthogonal array. New suspension design has achieved good shock resistance and frequency response function. Measurement results had good correlation with FEM simulation
{"title":"Adopting Taguchi Method on head suspension assembly for mobile hard disk drives","authors":"H. Takahashi, Y. Kojima, T. Kanemura, S. Nakamura","doi":"10.1109/APMRC.2004.1521951","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521951","url":null,"abstract":"Taguchi method was applied for designing head suspension assembly for mobile hard disk drives (HDDs). Operational shock resistance and positioning accuracy are very important. Control factors of suspension shape were selected and shock resistance and frequency response analysis by finite element method (FEM) simulation were conducted for L18 orthogonal array. New suspension design has achieved good shock resistance and frequency response function. Measurement results had good correlation with FEM simulation","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122263050","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}
Pub Date : 2004-08-16DOI: 10.1109/APMRC.2004.1521953
C. Bi, Dezheng Wu, Q. Jiang, Z. Liu
Active magnetic bearing is a promising candidate for next generation spindle motors of hard disk drives. In this paper, an iterative learning control scheme is proposed to suppress the rotor poison runout induced by the unbalanced forces in AMB. The ILC controller can produce the synchronous compensation force by iteratively "learning" rotor runout information. This compensation force makes the rotor rotate about its geometric axis
{"title":"Runout compensation in active magnetic bearings with iterative learning control scheme","authors":"C. Bi, Dezheng Wu, Q. Jiang, Z. Liu","doi":"10.1109/APMRC.2004.1521953","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521953","url":null,"abstract":"Active magnetic bearing is a promising candidate for next generation spindle motors of hard disk drives. In this paper, an iterative learning control scheme is proposed to suppress the rotor poison runout induced by the unbalanced forces in AMB. The ILC controller can produce the synchronous compensation force by iteratively \"learning\" rotor runout information. This compensation force makes the rotor rotate about its geometric axis","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123743392","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}
Pub Date : 2004-08-16DOI: 10.1109/APMRC.2004.1521975
Sung-won Park, Jun Jeong, Hyun-Seok Yang, Young-Pil Park, N. Park
This paper presents a design method for repetitive controller in the sense of minimum TMR. For TMR prediction, disturbances acting on a disk drive are identified and servo performance is estimated using identification result. The validity of the identification and estimation procedure is proved through experiments. As a repetitive controller, an add-on type is adopted, and PID controller is used for base tracking controller. Each controller is optimized for minimum TMR. Whole system performance is simulated and design criterion is suggested. For improved response in both transient and steady state, two kinds of gain-switching method (discrete, continuous) are applied and switching effect also investigated
{"title":"Repetitive controller design for minimum TMR in HDD","authors":"Sung-won Park, Jun Jeong, Hyun-Seok Yang, Young-Pil Park, N. Park","doi":"10.1109/APMRC.2004.1521975","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521975","url":null,"abstract":"This paper presents a design method for repetitive controller in the sense of minimum TMR. For TMR prediction, disturbances acting on a disk drive are identified and servo performance is estimated using identification result. The validity of the identification and estimation procedure is proved through experiments. As a repetitive controller, an add-on type is adopted, and PID controller is used for base tracking controller. Each controller is optimized for minimum TMR. Whole system performance is simulated and design criterion is suggested. For improved response in both transient and steady state, two kinds of gain-switching method (discrete, continuous) are applied and switching effect also investigated","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129606467","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}
Pub Date : 2004-08-16DOI: 10.1109/APMRC.2004.1521964
Kyoung-Su Park, Moon-Gyo Jung, Yonghyun Lee, N. Park, Hyun-Seok Yang, Young-Pil Park
L/UL (Load/Unload) dynamic characteristics are affected by various parameters, the friction between lift tap and ramp profiles and so on. Also, the L/UL speed is restricted and the power consumption is determined by these parameters. The mathematical governing equations are derived for four ramp step and suspension characteristics. And the experiment is carried out in order to verify L/UL dynamic characteristics when the lift tap moves along the ramp. As the results of simulation and experiment, the bias force of flex-cable is changed by ramp profile. In the case of this system, the flex cable pushes the actuator until step 3. But that pulls the actuator in step 4.
{"title":"Analysis of L/UL characteristics using numerical model and measurement of lateral velocity profiles","authors":"Kyoung-Su Park, Moon-Gyo Jung, Yonghyun Lee, N. Park, Hyun-Seok Yang, Young-Pil Park","doi":"10.1109/APMRC.2004.1521964","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521964","url":null,"abstract":"L/UL (Load/Unload) dynamic characteristics are affected by various parameters, the friction between lift tap and ramp profiles and so on. Also, the L/UL speed is restricted and the power consumption is determined by these parameters. The mathematical governing equations are derived for four ramp step and suspension characteristics. And the experiment is carried out in order to verify L/UL dynamic characteristics when the lift tap moves along the ramp. As the results of simulation and experiment, the bias force of flex-cable is changed by ramp profile. In the case of this system, the flex cable pushes the actuator until step 3. But that pulls the actuator in step 4.","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122183094","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}
Pub Date : 2004-08-16DOI: 10.1109/APMRC.2004.1521962
Kyoung-Su Park, Jeong-il Chun, N. Park, Hyun-Seok Yang, Young-Pil Park
In order to increase an areal density, femto slider has been used in this system nowadays. When the design parameters are changed a little due to fabrication, assembly error and operating conditions, the L/UL dynamic characteristics of femto slider can be changed greatly. This paper investigates the static air bearing characteristics of two sliders which have a different ABS. L/UL dynamic performance is examined using the numerical simulation for various design and operating parameters. For the same suspension parameters and operating conditions, L/UL dynamics show the different characteristics for different ABS system. In case of femto slider used in this simulation, the rebounding happens in a lower load speed and the simulation results shows the clearance between slider and disk become small in unloading process.
{"title":"Analysis of L/UL dynamic characteristics of femto sliders in the micro drive","authors":"Kyoung-Su Park, Jeong-il Chun, N. Park, Hyun-Seok Yang, Young-Pil Park","doi":"10.1109/APMRC.2004.1521962","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521962","url":null,"abstract":"In order to increase an areal density, femto slider has been used in this system nowadays. When the design parameters are changed a little due to fabrication, assembly error and operating conditions, the L/UL dynamic characteristics of femto slider can be changed greatly. This paper investigates the static air bearing characteristics of two sliders which have a different ABS. L/UL dynamic performance is examined using the numerical simulation for various design and operating parameters. For the same suspension parameters and operating conditions, L/UL dynamics show the different characteristics for different ABS system. In case of femto slider used in this simulation, the rebounding happens in a lower load speed and the simulation results shows the clearance between slider and disk become small in unloading process.","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117246556","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}
Pub Date : 2004-08-16DOI: 10.1109/APMRC.2004.1521960
B. Shi, S. Wang, D. Shu, J. Luo, H. Meng, Q. Ng, R. Zambri
A thorough understanding of the dynamic behavior under shock is essential to the development of new generation disk drives. In this paper, the effects of the acceleration pulse shape under conditions of different pulse widths are studied for a given resonant frequency. To emphasize the fundamental aspects of the pulse shape effects, the dynamic system investigated was a single actuator arm without inclusion of the head disk interface or suspension
{"title":"Power spectrum analysis of the excitation pulse effects in drop test simulation of hard disk drives","authors":"B. Shi, S. Wang, D. Shu, J. Luo, H. Meng, Q. Ng, R. Zambri","doi":"10.1109/APMRC.2004.1521960","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521960","url":null,"abstract":"A thorough understanding of the dynamic behavior under shock is essential to the development of new generation disk drives. In this paper, the effects of the acceleration pulse shape under conditions of different pulse widths are studied for a given resonant frequency. To emphasize the fundamental aspects of the pulse shape effects, the dynamic system investigated was a single actuator arm without inclusion of the head disk interface or suspension","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132265309","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}
Pub Date : 2004-08-16DOI: 10.1109/APMRC.2004.1521961
F. Gao, F. F. Yap, Yang Cao
An approach is present to predict vibro-acoustic dynamic characteristics of ball-bearing disks/spindle systems of hard disk drives (HDD) including flexible stationary structures, such as top cover, shaft and basement, etc. The discrete governing equations of motion for the system are derived through the use of Lagranigain equation. The flexible stationary part is examined and the noise predicting from the stationary part are calculated and analyzed based on finite element method. Some experiments were carried out to testify the approach. The results show that the noise level is determined by the motor forcing function, disks/spindle unbalance mode (0,0) and the amplification due to structural resonance of the stationary part.
{"title":"Study on vibro-acoustic characteristics of disks-spindle system of hard disk drives","authors":"F. Gao, F. F. Yap, Yang Cao","doi":"10.1109/APMRC.2004.1521961","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521961","url":null,"abstract":"An approach is present to predict vibro-acoustic dynamic characteristics of ball-bearing disks/spindle systems of hard disk drives (HDD) including flexible stationary structures, such as top cover, shaft and basement, etc. The discrete governing equations of motion for the system are derived through the use of Lagranigain equation. The flexible stationary part is examined and the noise predicting from the stationary part are calculated and analyzed based on finite element method. Some experiments were carried out to testify the approach. The results show that the noise level is determined by the motor forcing function, disks/spindle unbalance mode (0,0) and the amplification due to structural resonance of the stationary part.","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114155317","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}
Pub Date : 2004-08-16DOI: 10.1109/APMRC.2004.1521956
Y. Hsia, P. Jones, L. Li, J. Hohlfeld
The HAMR head-disc interface is the subject of intense research due to its potential to extend the areal density of magnetic recording to the Tb/in2 and above range. We have studied possible material constituents of this interface to determine their robustness for this technology. Of specific interest are the effects of repeated high thermal excursions on these materials. Furthermore, it is expected that each bit may be irradiated ~107 times under normal operating conditions, thus placing a limit on accumulated effects due to this surface irradiation
{"title":"HAMR head-disk interface - lubricant desorption and laser damage study","authors":"Y. Hsia, P. Jones, L. Li, J. Hohlfeld","doi":"10.1109/APMRC.2004.1521956","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521956","url":null,"abstract":"The HAMR head-disc interface is the subject of intense research due to its potential to extend the areal density of magnetic recording to the Tb/in2 and above range. We have studied possible material constituents of this interface to determine their robustness for this technology. Of specific interest are the effects of repeated high thermal excursions on these materials. Furthermore, it is expected that each bit may be irradiated ~107 times under normal operating conditions, thus placing a limit on accumulated effects due to this surface irradiation","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121207162","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}
Pub Date : 2004-08-16DOI: 10.1109/APMRC.2004.1521969
Young-Bae Chang, Eul-Gyoon Lim, N. Park, Young-Pil Park
In this study, Barasch's method is improved upon to calculate the natural frequencies of rotating disks in less time. The characteristics of the natural frequencies in rotating coordinates are studied and an estimation procedure that uses cantilever and conic curves is suggested to conveniently calculate the natural frequencies and mode shapes. The convergence speed of Barasch's method is accelerated by estimating an initial value of the solution for the characteristic equation
{"title":"Natural frequency analysis of a rotating circular disk using the reformed Barasch's method","authors":"Young-Bae Chang, Eul-Gyoon Lim, N. Park, Young-Pil Park","doi":"10.1109/APMRC.2004.1521969","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521969","url":null,"abstract":"In this study, Barasch's method is improved upon to calculate the natural frequencies of rotating disks in less time. The characteristics of the natural frequencies in rotating coordinates are studied and an estimation procedure that uses cantilever and conic curves is suggested to conveniently calculate the natural frequencies and mode shapes. The convergence speed of Barasch's method is accelerated by estimating an initial value of the solution for the characteristic equation","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129398211","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}
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