한국소음진동공학회논문집 (Transactions of the Korean Society for Noise and Vibration Engineering)

  • 제16권1호
  • /
  • Pages.75-80
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  • 2006
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  • 1598-2785(pISSN)
  • /
  • 2287-5476(eISSN)
한국소음진동공학회 (The Korean Society for Noise and Vibration Engineering)
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유체동압베어링을 사용하는 하드디스크 드라이브 스핀들 시스템에서 발생하는 정전기 방전에 관한 실험적 연구

Experimental Study on the Electrostatic Discharge in the HDD Spindle System Using Fluid Dynamic Bearings

  • 강민구 (한양대학교 기계공학부) ;
  • 장건희 (한양대학교 대학원 정밀기계공학과)
  • 발행 : 2006.01.01
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초록

This paper introduces the mechanism of the ESD(electrostatic discharge) in the HDD spindle system using FDBs(fluid dynamic bearings). When a HDD(hard disk drive) spindle system is rotating, triboelectric charging occurs in the FDBs through the friction between the lubricant and the rotating shaft or between the lubricant and stationary sleeve. And this electrostatic charge is accumulated in the rotating parts of the HDD spindle system because they are insulated from the ground by the lubricant. This research shows experimentally that the behavior of electric charge and discharge in the FDB spindle system is the same as that of a capacitor. It also measures the electrostatic voltage difference between the rotating and stationary parts in the FDB spindle system due to the change of humidity, supporting load and motor speed. This research shows that the control of ESD is required in the HDD spindle system using FDBs, because the electrostatic charge accumulated in the FDB spindle system may cause the breakdown damage of the GMR head and data loss consequently.

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참고문헌

  1. Lee, H. J., 2003, 'Understanding of HDD', Electronics Times, Seoul, in Korea, pp. 70-94
  2. Jenny Himle, 2002, 'Electrostatic Discharge Considerations for GMR Heads,' Magazine articles, http: //www.wallash.com/jenny.htm
  3. Albert Wallash., 2004, 'Electrostatic Discharge and Electrical Breakdown Study of the Head-Disk Interface in a Hard Disk Drive,' IEEE Trans. on Magn., Vol. 40, pp. 5157-5159
  4. Lydia Baril, Mark Nichols, and Albert Wallash., 2002, 'Degradation of GMR and TMR Recording Heads Using Very-short-duration ESD Transients,' IEEE Trans. on Magn., Vol.38, pp. 1751-1755
  5. Albert Wallash., 2003, 'ESD Challenges in Magnetic Recording: Past, Present and Future,' 41st Annual International Reliability Physics Symposium. Dallas, Texas
  6. Albert Wallash, 2002, 'Understanding ESD Damage to Magnetoresistive (MR) Recording Heads,' Magazine Articles, http://www.wallash.com/understa.htm
  7. Lee, D. C. and Jung, J. H., 1996, 'Prevention of Electrostatic Disaster and Obstacle to the Whole Industry,' Sungandang, Seoul, in Korea, pp. 2-3, 34-45