| 摘要 |
<p>The invention relates to a master device which can be used in a method for producing a recording medium, a substantially spirally or concentrically running main track structure and at least one substantially spirally or concentrically running secondary track structure being formed on the master device, the secondary track structure being arranged on at least one side of the main track structure, the secondary track structure having discontinuities varying an optically detectable surface texture of the recording medium in such a way that at least first auxiliary information is represented on the recording medium.</p> |
