Abstract: An optical disc apparatus is provided with optimum power control (OPC) to determine an optimum laser power needed for recording data on an optical disc. Such an apparatus comprises a controller to determine optimum writing power in such a way of re-establishing a new test zone when an erasing error is detected on an initially established test zone in order to perform the OPC. When the erasing error is detected on a test zone of an OPC zone, a new test zone is re-established, so that OPC is performed rapidly while reducing an error frequency occurring when optimum writing power is not determined.

Abstract: A method of managing optimum power control (OPC) data in a lead-in zone of a rewritable high-density optical disc, wherein an OPC back data zone is allocated in the lead-in zone of the rewritable high-density optical disc and OPC data is written in the OPC back data zone so that a subsequent OPC process can be immediately performed based on the written OPC data. The method includes allocating a specified zone used in performing an OPC process within the lead-in zone of the rewritable high-density optical disc, writing OPC data for the OPC process in the specified zone, reading the OPC data written in the specified zone, and performing the OPC process based on the read OPC data.