An optical disk 101 is of a type in which information is recorded on a groove track, and an optical disk 107 is of a type in which information is recorded on a land track. The optical disk 101 has a control data area 102, and a data recording area 103 in which user data is recorded. The optical disk 107 has a control data area 108, and a data recording area 109 in which user data is recorded. A code for indicating the groove track or the land track onto which tracking servo control is executed is provided both in the control data area 102 of the optical disk 101, and in the control data area 108 of the optical disk 107.