Patent ID: 7382702
Filing Date: 2008-06-03
Classification: G11B

Abstract:
1. An apparatus to reproduce data from a recordable information storage medium that includes a plurality of recording layers, the apparatus comprising: a pickup irradiating a beam onto the information storage medium; a reproducing signal processor receiving a beam reflected from the information storage medium through the pickup for signal processing; and a controller controlling the reproducing signal processor and the pickup to reproduce the data contained in the reflected beam, the data having been recorded according to an optimum power control (OPC) determined by recording other data on one of the plurality of recording layers on at least a portion through which a test beam is passed to determine an optimum recording power, and performing the optimum power control (OPC) on a predetermined another one of the plurality of recording layers, wherein the portion through which the test beam is passed is recordable and not an OPC region of the one of the plurality of recording layers, and is positioned to cover and face all of an OPC region of the predetermined another recording layer.