Master device for use in method for manufacturing recording medium, comprises spiraled or concentrically extending main track structure and spiraled or concentrically extending secondary track structure

摘要

The master device comprises a spiraled or concentrically extending main track structure (1) and a spiraled or concentrically extending secondary track structure (2). The secondary track structure is arranged on one side of the master track structure. The secondary track structure has disruptions varying an optically detectable surface property of the recording medium to such an extent that auxiliary information is produced on the recording medium. Independent claims are also included for the following: (1) a device for manufacturing a master device (2) a device for manufacturing a recording medium.