Patent ID: 7796483

Claim:
A method for evaluating read stability of an optical disc, the method comprising: repeating readout of the optical disc using a laser beam at each of at least two read powers including a read power Pr which is set higher than a normal read power Pr 1 contained in normal readout condition setting information recorded on an optical recording medium, or high than a recommended read power Pr 2 defined in stored specifications of an information reproducing apparatus, the powers being different from each other; drawing a graph in which inverses of the read powers are plotted on a horizontal axis and in which on a vertical axis the logarithm of a repeated readout number for each of the read powers is plotted, the repeated readout number being the number of repetitions of the readout when a characteristic value for the number of repetitions of the readout varies and reaches a predetermined value; and evaluating read stability by using a gradient of the graph.