Patent ID: 8094545

Claim:
A recording medium including at least two layers, each of which includes an inner area, a data area, and an outer area, comprising: a first layer having at least a first test area contained in the inner area, and a third test area and a first protection area contained in the outer area; and a second layer having at least a control data area contained in the inner area, a second test area and a second protection area contained in the outer area, wherein the inner area is physically separate from the outer area, the first, second and third test areas are formed by a predetermined wobble modulation method equal to that of the data area, the modulation method for use in the first, second and third test areas and the data area is indicative of both an MSK (Minimum Shift Keying) wobble modulation method and HMW (Harmonic Modulated Wave) modulation method, and only an MSK (Minimum Shift Keying) modulation method is applied to the first and second protection area, and the control data area is embossed in the form of wobbles, wherein the control data area in the second layer overlaps with the first test area in the first layer with respect to the incident beam, and the second test area in the second layer overlaps with the third test area in the first layer with respect to the incident beam.