Abstract: A hybrid optical disc recording medium has concurrently a hybrid read-only area and a rewritable area on an optical substrate. The substrate of the read-only area has pre-pits, and the substrate of the rewritable area has pre-grooves. The pre-pits and the pre-grooves have the same depth. Thus when making the stampers for producing the hybrid optical disc, the technical problems of difficult to control the yields that incur to conventional techniques of different depths of the pits and the grooves can be effectively resolved. Experiments and test results indicate that the hybrid optical disc recording medium of the invention that have the same depth for the pits and the grooves, and extended grooves, can generate signals to meet the standards of the specifications.

Abstract: A hybrid optical disc recording medium has concurrently a hybrid read-only area and a rewritable area on an optical substrate. The substrate of the read-only area has pre-pits, and the substrate of the rewritable area has pre-grooves. The pre-pits and the pre-grooves have the same depth. Thus when making the stampers for producing the hybrid optical disc, the technical problems of difficult to control the yields that incur to conventional techniques of different depths of the pits and the grooves can be effectively resolved. Experiments and test results indicate that the hybrid optical disc recording medium of the invention that have the same depth for the pits and the grooves, and extended grooves, can generate signals to meet the standards of the specifications.