| 摘要 |
PURPOSE:To perform tracking servo control by one system in both of recording area and read-only area in one medium by forming tracking servo data in the recording area and writing data only for reproducing in the form of displacement of the servo tracks in the width direction of the read-only area. CONSTITUTION:The magneto-optical disk 10 contains a RAM area 2 in the outer area and a ROM area 6 in the inner area. In the RAM area 2, land areas between guide grooves or in guide grooves preorly formed are used as recording tracks 4 to record data. In the ROM area 6, read-only data is recorded in the track 7 which is expressed by displacement in the width direction. The frequency of the data recorded by displacement in the width direction is higher enough than the frequency of tracking error signals. By recording the read-only data in the ROM area with using displacement of track width, detection of tracking error using the guide grooves can be performed as well as in the RAM area 2. Thereby, tracking can be commonly done in areas 2, 6 even when track jump is caused. Thus, tracking can be performed in high stable state with good servo pull-in responsiveness. |
