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The possibility of 300-500 Gbit/in2 perpendicular recording using granular recording media has been investigated through micromagnetic simulation based on the Langevin equation. Writability and thermal stability in 10 years were obtained changing media parameters such as the grain size D, the grain separation d, and the thickness of the recording layer tmag for proper combination of the grain saturation magnetization Ms-grain and the grain perpendicular anisotropy energy Ku-grain. It was found that high-density recording is realized under the large grain separation, the large grain saturation magnetization, and the large grain anisotropy energy. The read/write calculation using ordered medium with D of 4.2 nm, d of 2.3 nm, tmag of 12.0 nm, Ms-grain of 1313 emu/cm3, and Ku-grain of 7.0 Merg/cm3 confirmed the possibility of 1303 kFCI and 1954 kFCI perpendicular recording, leading to 325 and 488 Gbit/in2 with 250 kTPI (track pitch of 102 nm).