Patent ID: 7463566

Claim:
A multi-layered optical information storage medium comprising: a first storage layer comprising a first lead-in area having first information; a second storage layer comprising a second lead-in area having second information; wherein the first information comprises physical format information for both the first storage layer and the second storage layer indicating whether the first storage layer and the second storage layer are read-only or recordable, and hybrid identification information indicating whether an additional storage layer exists, the additional storage layer being reproducible with a second laser different than a first laser, the first laser used for reproducing the first and second storage layers, wherein the second information comprises the physical format information for both the first storage layer and the second storage layer indicating whether the first storage layer and the second storage layer are read-only or recordable, and the hybrid identification information indicating whether the additional storage layer exists, the additional storage layer being reproducible with the second laser different than the first laser, the first laser used for reproducing the first and second storage layers.