Patent ID: 7668073

Claim:
A hybrid disk having a plurality of recording layers that are different in format from each other, comprising: a first recording layer to and/or from which data is written or read by a first format beam; and a second recording layer to and/or from which data is written or read by a second format beam and which is further from an optical pickup than the first recording layer, wherein a reflectivity of the first recording layer and a reflectivity of the second recording layer with respect to the first format beam are interrelated to control a percentage of light which is reflected after being transmitted to the second recording layer and reflected back through the first recording layer and which is less than the percentage of light which is reflected by the first recording layer with respect to the first format beam, and the first recording layer comprises at least one metal layer, and the second recording layer comprises at least two metal layers and at least one dielectric layer disposed between the at least two metal layers.