changing focus of the laser beam from the data recording layer to the image drawing layer at a position in a radial direction of the disk where the position information is detected.
changing focus of the laser beam (from the data recording layer to the image drawing layer) at a position in a radial direction of the disk where (<-position) the position information is detected.
changing focus of the laser beam (from the data recording layer to the image drawing layer) at a position in a radial direction of the disk where (<-position) the position information is detected.