DATA STORAGE MEDIA WHICH MINIMIZES AN EFFECT ON OTHER INFORMATION STORAGE LAYERS WHEN PERFORMING AN OPTIMAL POWER CONTROL IN AN OPTIMAL POWER CONTROL REGION AND USES A REGION OF INFORMATION STORAGE LAYER EFFICIENTLY AT THE SAME TIME

摘要

PURPOSE: A data storage media is provided to minimize an effect had on other data storage layer and to efficiently use a data storage area when an OPC(Optimal Power Control) is performed at an OPC area arranged at each data storage layer. CONSTITUTION: The media comprises the first and the second data storage layer(L0,L1). The first data storage layer(L0) includes the first OPC area, the first reservation area, and the first data storage area. The second data storage layer(L1) includes the second reservation area, the second OPC area, and the second data storage area. The first and the second data storage area store data updated at each usage, e.g. addresses of used areas or state data of storage layers. The state data of storage layers includes a record mode and a final address recorded according to the record mode. The first and the second OPC areas are arranged on different radiuses. The first OPC area faces the second reservation area, and the second OPC area faces the first reservation area. The first and the second data storage area are arranged on the same radiuses.