Patent ID: 7746587

Claim:
A magnetic recording apparatus comprising: a magnetic recording medium including a ROM area, and a RAM area on which rewritable information is magnetically recorded, the ROM area having a pattern of a first-type segment sequence indicating first-type modulation information which is fixedly recorded on the ROM area based on a first type-modulation scheme, the first-type segment sequence being formed as a sequence of magnetic and nonmagnetic segments, and a recording unit configured to record second-type modulation information on the ROM area based on a second-type modulation scheme, the recording unit selectively magnetizing the magnetic segments in the pattern to record a second-type segment sequence of first and second segments magnetized in one and opposite directions, which indicates the second-type modulation information, wherein a maximum inversion interval between the first-type magnetic and nonmagnetic segments is equal to or less than a minimum magnetization inversion interval based on the second-type modulation scheme.