Development of a numerical simulation system for flying hend slider design in magnetic disk storage with recording density

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In the head-medium interface design of a magnetic disk drive, a new mixed roughness averaging theory was introduced and implemented into the molecular gas lubrication equation. A dynamic simulation system which can take the texture pattern of arbitrary form into consideration was realized based on the results.To calculate dynamic characteristics of a head slider on surface texture patterns which is composed of several geometrical shapes, the unit roughness model is modified and applied to the molecule gas lubrication equation. Moreover, the effect of the texture pattern is pre-calculated and compiled a flow coefficient database. This enables the calculation of pressure distribution of a bearing area when mixed texture patterns pass through.The developed simulation system enables rapid and efficient calculation while changing parameters that affect the numerical solution of the lubrication equation and the equation of slider motion. Especially, when the pressure solution diverges, the system rewinds several time steps and retries the calculation with modified parameters. Therefore, it can adjust parameters efficiently without recalculating from the beginning. Furthermore, the binocular stereo graphics is introduced as a display system to improve the human interface of the system. The parameter of the optimal stereo projection was clarified based on evaluation of human visual perception.Using the system developed in the present research, the static and dynamic flying characteristics of the typical sliders (taper-flat type, negative-pressure type and step-pad type) on a patterned disk surface were demonstrated. It is thought that the result of this research is effective in the design of the flying head slider and the texture patterned disk for the next generation of high-density recording magnetic disk storage.