6B is an enlarged plan view of the photoresist coated glass disk in FIG. 16A; [0112]FIG. 16C is an enlarged sectional view of the photoresist coated glass disk in FIG. 16A; [0113]FIG. 16D is a graph of a reproduction signal when the recorded photoresist coated glass disk in FIG. 16A is reproduced; [0114]FIG. 17 is a block diagram of another optical disk recording-reproducing apparatus according to