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Recently, higher areal recording density of hard disk drive (HDD) is achieved by increasing not only linear density (bits per inch) but also track density (tracks per inch). Then, three-dimensional (3-D) read/write (R/W) simulation is necessary in order to design a high-density recording system by utilizing magnetic field analysis. In this paper, a 3-D R/W simulation system using the edge-based finite-element method (FEM) is developed by introducing the 3-D medium hysteresis model based on the ensemble of the Stoner-Wohlfarth (SW) particles. As it is not easy to apply the Newton-Raphson method for the nonlinear analysis of SW model, an underrelaxation iteration method is used. The effectiveness of the 3-D R/W simulation system is illustrated by applying to the magnetic field analysis of a SPT (single-pole-type) head/DL (double-layer) medium perpendicular recording system.