• Title/Summary/Keyword: Hard Disk Drive

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Shock Response Analysis of 2.5in Hard Disk Drive Supported by Rubber Mounts (고무 마운트로 지지된 2.5인치 하드디스크 드라이브의 충격 응답 해석)

  • seol Woong;Chang Young-Bae;Park No-Cheol;Park Young-Pil
    • 정보저장시스템학회:학술대회논문집
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    • pp.215-216
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    • 2005
  • Nowadays, mobility as well as basic performances has been the important performance index of hard disk drive, It makes a system unstable to satisfy mobility, huge storage capacity and high transfer rate. Shock and vibration analysis has been important because hard disk drive could be exposed by external shock and vibration. The probability of this situation has been increasing. In this research, each component and the whole system of 2.5in HDD are made to a finite element model. Results of finite element analysis are compared with the results of experimental modal analysis. Shock analysis is executed for 2.5in hard disk drive.

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Repetitive Control of Track Following Error in a Hard Disk Drive (하드 디스크 드라이브의 반복 추종 오차 제어)

  • D.Y. Jeon;I.Y. Jong
    • Journal of the Korean Society for Precision Engineering
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    • v.13 no.5
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    • pp.131-138
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    • 1996
  • This paper suggests a servo control algorithm to reduce the repeatable tracking error which is not explicitly taken into account in the design of a conventional PID controller of a computer hard disk drive. The robust stability of the repetitive control system with multiplicative modelling error is analyzed, and the controller was implemented using a fixed point DSP(Digital Signal Processor). Experimental results show that the repetitive errors are suppressed effectively by the proposed controller.

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Numerical Prediction of Flow Field in a Hard Disk Drive (하드 디스크 드라이브 내부의 유동장에 관한 수치적 연구)

  • Lee, Jae-Heon;Back, Y.R.;Kim, K.S.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.3 no.3
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    • pp.206-214
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    • 1991
  • Flow field in a hard disk drive has been predicted numerically. Theoretical model was constructed based on a commercially available hard disk drive with 40 Mega byte capacity. Since the gap between disk tip and shroud is not homogeneous in real hard disk drive, three kinds of gap size have been tested as computational model. The discussion has been made on the circumferential velocity, radial velocity, and pressure fields. As a result, the average shear stress on the disk surface was reduced as the gap size decreased. This means that the shroud should be designed compactly to reduce power consumption of the spindle motor.

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A Pattern Classification of HDD (Hard Disk Drive) Defect Distribution Using Fuzzy Inference (퍼지 추론을 이용한 HDD (Hard Disk Drive) 결함 분포의 패턴 분류)

  • Moon Un-Chul;Kwon Hyun-Tae
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.54 no.6
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    • pp.383-389
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    • 2005
  • This paper proposes a pattern classification algorithm for the defect distribution of Hard Disk Drive (HDD). In the HDD production, the defect pattern of defective HDD set is important information to diagnosis of defective HDD set. In this paper, 5 characteristics are determined for the classification to six standard defect pattern classes. A fuzzy inference system is proposed, the inputs of which are 5 characteristic values and the outputs are the possibilities that the input pattern is classified to standard patterns. Therefore, classification result is the pattern with maximum possibility. The proposed algorithm is implemented with the PC system for defective HDD sets and shows its effectiveness.

An Expert System using Fuzzy and Binary logic for the Fault Diagnosis of Hard Disk Drive Test System (Hard Disk Drive 검사시스템의 고장 진단을 위한 퍼지-이진 논리 결합형 전문가 시스템에 관한 연구)

  • 문운철;이승철;남창우
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.53 no.6
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    • pp.457-464
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    • 2004
  • Hard Disk Drive (HDD) test system is an equipment for the final test of HDD product by iterative read/write/seek test. This paper proposes an expert system for the fault diagnosis of HDD test systems. The purposed expert system is composed with two cascade inference, fuzzy logic and conventional binary logic. The fuzzy logic determines the possibility of the system fault using the test history data, then, the binary logic inferences the fault location of the test system. The proposed expert system is tested in SAMSUNG HDD production line, KUMI, KOREA, and shows satisfactory results.

A Study on Fuzzy Expert System for the Fault Diagnosis of Hard Disk Drive Test System (Hard Disk Drive 검사 시스템의 고장 전단용 퍼지 전문가 시스템에 관한 연구)

  • Mun, Un-Cheol;Gwon, Hyeon-Tae;Nam, Chang-U
    • Proceedings of the KIEE Conference
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    • pp.625-628
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    • 2003
  • This paper proposes a fuzzy expert system for the fault diagnosis of Hard Disk Drive(HDD) test systems. The purposes of this system are diagnosis of HDD test systems, detection of system faults using test history, and presentation of the way of repair. Proposed Expert system is designed with Fuzzy logic and Binary Logic to present the way of repair using HDD tort result, HDD test history. The proposed system is simulated with actual data from SAMSUNG HDD product line in KUMI, KOREA, and show effective results.

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Investigation of Particle Generation in a Hard Disk Drive During the Start/Stop Period (구동 및 정지시 하드 디스크 드라이브 내 입자 발생 특성에 관한 실험적 연구)

  • Park, Hee-Sung;Yoo, Yong-cheol;Bae, Gwi-Nam;Hwang, Jung-Ho
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.23 no.6
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    • pp.744-752
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    • 1999
  • Particle contamination in a hard disk drive has been recognized as an important issue because particles can significantly affect the reliability of the drive. In this study, characteristics of the particle generation in a hard disk drive during the start/stop period were investigated. The number of particles generated in the drive was measured at 5 locations by using condensation nucleus counters(CNC) with sampling probes. It was found that most of particles were generated whenever the drive started or stopped. The number of particles detected by the condensation nucleus counter depended on sampling parameters including sampling location, shape of sampling probe, and sampling velocity.

Surface treatment of mold components for quality improvement (금형부품의 품질향상을 위한 표면처리에 관한 연구)

  • Baek, Seung-Yub;Lee, Ha-Sung;Gang, Dong-Myung
    • Journal of the Korea Society of Die & Mold Engineering
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    • v.2 no.5
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    • pp.43-47
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    • 2008
  • Micro Electrochemical Machining(Micro ECM) has traditionally been used in highly specialized fields such as those of the aerospace and defense industries. It is now increasingly being applied in other industries where parts with difficult-to-cut material, complex geometry and tribology such as compute. hard disk drive(HDD) are required. Pulse Electrochemical Micro-machining provides an economical and effective method for machining high strength, high tension, heat-resistant materials into complex shapes such as turbine blades of titanium and aluminum alloys. Usually aluminum alloys are used bearings to hard disk drive in computer. In order to apply aluminum alloys to bearing used in hard disk drive, this paper presents the characteristics of Micro ECM for aluminum alloy.

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Pattern Classification of HDD (Hard Disk Drive) Defect Distribution Using Rectangular Coordinates (직교좌표를 이용한 HIDD (Hard Disk Drive) 결함분포의 패턴 분류)

  • Moon, Un-Chul;Kim, Hyeong-Seok;Kang, Kyung-Hoon
    • Journal of The Institute of Information and Telecommunication Facilities Engineering
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    • v.2 no.1
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    • pp.71-77
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    • 2003
  • 본 논문에서는 불량 하드디스크 드라이브의 수리판정 자동화를 위해 필요한 하드디스크 드라이브(Hard Disk Drive, HDD) 결함의 분포패턴의 분류에 관한 연구 결과를 소개한다. HDD 제조공정에서는 테스트 진행 중 검출된 결함에 관한 정보를 HDD 내부에 기록한다. 불량으로 판별된 HDD는 내부에 기록된 결함의 분포론 관찰한 후, 불량의 종류 및 그에 따른 처리방안을 결정한다. 본 논문에서는 효율적인 결함분포 패턴의 특징추출을 위해, 하드디스크의 물리적 특성에 대한 분석을 바탕으로 극좌표 (Polar Coordinates) 방식으로 표현된 결함 위치 데이터를 직교좌표(Cartesian Coordinates)로 변환한다. 그리고 디스크 상의 두 동심원 사이의 공간을 정해진 회전각별로 등분한 후, 나누어진 구간별로 결함 발생빈도 히스토그램 (Histogram) 분석을 수행하여 결함분포의 패턴을 분류하는 알고리즘을 제시한다. 설계된 알고리즘은 실제 HDD 제조공정에서 발생한 불량 HDD Set을 대상으로 적용한 결과, 그 효용성이 검증되었다.

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