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http://dx.doi.org/10.5050/KSNVN.2006.16.1.075

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

Kang, Min-Gu (한양대학교 기계공학부)
Jang, Gun-Hee (한양대학교 대학원 정밀기계공학과)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.16, no.1, 2006 , pp. 75-80 More about this Journal
Abstract
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.
Keywords
HDD; FDB; Break Down Voltage; ESD; Giant Magneto-resistive Head;
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