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This paper presents the characteristics of the axial and radial surface tension sealing structures. Based on the 6-DOF rotor-bearing coupled dynamic analysis, the movement of the shaft relative to the sleeve during and immediately after a shock is calculated. By use of the finite volume method, volume of fluid, K-e turbulence model and dynamic mesh technique, the anti-shock capacity and anti-centrifugal force capacity of the two structures are investigated. The results are significant for optimal design of the sealing structure in hard disk drive fluid dynamic bearings spindles.