FIELD: physics, computer engineering.
SUBSTANCE: invention discloses a data medium and a recording and reproduction apparatus. The data medium has a first information storage layer (L0), having a first optimum power control region (47_L0), and a second information storage layer (L1) adjoining the first information storage layer (L0), having a second optimum power control region (47_L1). The first and second optimum power control regions (47_L0, 47_L1) do not overlap. First buffer regions (45_L0, 45_L1) are situated on one side of the first optimum power control region (47_L0) and the second optimum power control region (47_L1), respectively. A region (50_L0) for reproduction only, which stores data for reproduction only, is situated in the first information storage layer (L0) such that the region (50_L0) for reproduction only is situated opposite the second optimum power control region (47_L1) of the second information storage layer (L1). The first information storage layer (L0) has a first protective region (51_L0). The second buffer region (49_L1) is situated on one side of the second optimum power control region (47_L1).
EFFECT: eliminating the effect of the optimum power control region on the quality of recording in the optimum power control region of the adjoining layer for an eccentric disc.
3 cl, 11 dwg, 1 tbl
