| 摘要 |
PURPOSE:To establish the said recording media easy for tracking at reproduction, by providing the guide groove for information recording groove tracking with the recording media reading in information optically outside the said recording area. CONSTITUTION:In the disc shape recording media 1 providing the recording area 3 consisting of the information groove recorded in the form readable optically outside of the center position 4, the guide groove 2 for information tracking is provided outside the area 3, fo example. Further, since one to several lines of the said guide grooves are enough for the purpose, the lowering in the recorded information density contained in the entire disc can not almost be caused. |
