| 摘要 |
A writable optical record carrier ( 100 ) comprising a plurality of recording layers LO, . . . , Ln- 1 separated by a spacer material, each recording layer comprising an optimum power calibration area ( 101,111,121,131 ) having a first portion ( 102,112,122 ) with an average reflection value representative of a recorded layer and a second portion ( 113,123,133 ) with an average reflection value representative of an unrecorded layer, a method, and an apparatus for forming optimum power calibration areas on such a writable optical record carrier are presented. The optimum power calibration areas partially overlap such that the optimum power calibration areas of each pair of consecutive recording layers form a step, and the first portions of said plurality of recording layers have the form of a staircase. Each step formed by a pair of consecutive recording layers k, k+1 has a preferred minimum step size.
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