Patent ID: 7391708

Claim:
An optical disk comprising: a recording track including: data recording regions where recording pits are formed for recording data; and header regions where pre-pits are formed for recording header information identifying said data recording regions, wherein said recording pits have a reflectance larger than that of a space, where said recording pits are not formed, wherein said recording pits and said pre-pits are formed such that, when optical beams having the same intensity are irradiated on said data recording regions and said header regions, an amplitude of a level of an optical signal reflected by said header regions is one of equal to and greater than that of a level of an optical signal reflected by said data recording regions, wherein the recording pits formed in the data recording regions have a highest reflectance, wherein said space in the header regions have a second highest reflectance, wherein said space in the data recording regions have a third highest reflectance, and wherein said pre-pits formed in the header regions have a lowest reflectance.