OPTICAL DISC, INFORMATION RECORDING METHOD, INFORMATION REPRODUCING METHOD, AND DISC DRIVE

摘要

According to one embodiment, a write-once optical disc which uses a short-wavelength laser allows BCA information recording even using a long-wavelength laser. To this end, a groove is cut in advance on a BCA part on a molded substrate of the optical disc to store a dye. In this way, the sensitivity of the dye in the BCA increases, to allow a laser having a wavelength other than the wavelength corresponding to information recording of the dye to record a barcode pattern on the BCA.