A storage medium includes tracks extending in a circumferential direction, user data areas formed on the tracks for storing user data, and servo frames corresponding to the user data areas and extending in a radial direction for storing servo data. Data correcting areas corresponding to the servo frames and extending in the radial direction adjacent the servo frames are provided for storing correcting data for correcting positional deviation of a read/write head resulting from an error in the servo data stored in the servo frames. The correcting data stored in the data correcting areas on the same track are separated by at least one correcting data area.