Patent ID: 7701657

Claim:
A perpendicular magnetic recording-method for recording data on magnetic recording medium, wherein the data has a minimum write width corresponding to at least a read detection width of a read head, the method comprising: perpendicularly recording ternary data in a first area on the magnetic recording medium corresponding to a first data value, the data recorded in the first area having a first magnetization state which continues at least during the minimum write width; perpendicularly recording ternary data in a second area on the magnetic recording medium corresponding to a second data value, the data recorded in the second area having a second magnetization state which continues at least during the minimum write width, the second magnetization state being oppositely magnetized from the first magnetization state; and perpendicularly recording ternary data in a third area on the magnetic recording medium corresponding to a third data value by alternating the first magnetization state and second magnetization state, each having a write width narrower than the minimum write width.