APPARATUS FOR REPRODUCING DATA FROM INFORMATION STORAGE MEDIUM HAVING MULTIPLE STORAGE LAYERS WITH OPTIMAL POWER CONTROL (OPC) AREAS AND BUFFER AREAS

摘要

AN INFORMATION STORAGE MEDIUM (130) AND AN APPARATUS FOR RECORDING AND/OR REPRODUCING THE INFORMATION STORAGE MEDIUM CAPABLE OF CONTROLLING OPTIMAL RECORDING POWER WITHOUT AN INFLUENCE OF AN OPTIMAL POWER CONTROL (OPC) AREA IN A LAYER UPON AN OPC AREA IN A DIFFERENT LAYER. THE INFORMATION STORAGE MEDIUM INCLUDES AT LEAST ONE INFORMATION STORAGE LAYER (L0; L1) INCLUDING AN OPTIMAL POWER CONTROL AREA FOR OBTAINING AN OPTICAL RECORDING CONDITION. OPC AREAS (20_L0; 20_L1) IN ADJACENT INFORMATION STORAGE LAYERS ARE DISPOSED WITHIN DIFFERENT RADIUSES OF THE INFORMATION STORAGE MEDIUM. ACCORDINGLY, EVEN WHEN THE INFORMATION STORAGE MEDIUM IS MADE ECCENTRIC OR HAS A MANUFACTURING ERROR, A RECORDING PROPERTY OF THE INFORMATION STORAGE MEDIUM IS PREVENTED FROM BEING DEGRADED DUE TO AN INFLUENCE OF AN OPC AREA IN AN INFORMATION STORAGE LAYER UPON AN OPC AREA IN AN ADJACENT INFORMATION STORAGE LAYER. FIGURE 8