Patent ID: 7721097
Filing Date: 2010-05-18
Classification: G11B,Y10T

Abstract:
1. An information recording medium in a disc shape, comprising at least: a first recording layer having a first test writing area to test-write therein first test-write information for calibration of laser light for recording, by irradiating the laser light thereto; and a second recording layer, located on a rear of said first recording layer as viewed from an irradiation side of the laser light and having a second test writing area to test-write therein second test-write information for calibration of the laser light, by irradiating the laser light thereto, wherein the first test writing area and the second test writing area are away from each other in a radial direction of said information recording medium as viewed from a normal direction of said information recording medium, in the first test writing area, an area portion of a predetermined size is used in order in an opposite direction of a track path of the first recording layer, in each operation of writing the first test-write information, and in the second test writing area, an area portion of a predetermined size is used in an opposite direction of a track path of the second recording layer, in each operation of writing the second test-write information.