Patent ID: 7495855

Claim:
A medium reading and writing apparatus comprising: a write linking position judging unit that judges whether a servo frame for reading/writing data is in a servo write linking position, wherein the servo write linking position is one of extra space or insufficient space generated at the last servo frame when servo synchronous marks on a track are equidistant, after one rotation of the track; and a data reading/writing unit that reads/writes the data using a medium synchronous write function, where a frequency of a clock used for reading/writing the data is corrected based on a distance between servo synchronous marks, if the write linking position judging unit judges that the servo frame is not in the servo write linking position, and reads/writes the data based on the clock of a predetermined frequency that is for the servo write linking position, if the write linking position judging unit judges that the servo frame is in the servo write linking position by detecting a special pattern in the servo frame.