Patent ID: 7839737

Claim:
An optical recording medium comprising: an optical-transmissible first substrate; a first recording layer disposed on said first substrate, on which information can be recorded by irradiating a laser beam from the first substrate's side; a second recording layer disposed on said first recording layer, on which information can be recorded by irradiating said laser beam; and each of said first recording layer and said second recording layer including power calibration areas to optimizing intensity of said laser beam; wherein recording of information on said first recording layer and recording of information in said second recording layer are performed forward opposite directions, and an optimum power control is performed on said first and second recording layers before recording any user data on said optical recording medium: wherein, in said first recording layer or said second recording layer, a direction toward which data is recorded in a user data area and a direction toward which a partition in an optimum power control area is used are different from each other.