Patent ID: 8599675

Claim:
A multi-layered information storage medium comprising: a first layer; and a second layer, wherein the first layer comprises a first recordable area with a first pre-groove, the second layer comprises a second recordable area with a second pre-groove, the first recordable area and the second recordable area are configured to store recording marks, an intensity of light reflected from the recording marks is higher than an intensity of light reflected from unrecorded portions, the first layer comprises a management data area, the management data area comprises a first management area, a second management area adjacent to the first management area, and a third management area adjacent to the second management area, the first management area is configured to store first management information relating to a first push-pull signal from the first pre-groove, the third management area is configured to store second management information relating to a second push-pull signal from the second pre-groove, and the second management area is configured to store third management information relating to the first layer and fourth management information relating to the second layer.