Patent ID: 7170848

Claim:
An optical recording medium as a phase change type optical recording medium provided with a main information area having a laminated thin film including an information layer capable of recording an information signal and a subsidiary information area for recording subsidiary information that is different from the information signal, which are divided in a plane direction of a substrate, wherein the information layer in the main information area is provided also in the subsidiary information area, and the information layer in the subsidiary information area has BCA pattern recorded in a stripe form such that a crystalline phase part and an amorphous phase part where a film remains in a state in which the film was formed are present alternately, wherein the BCA pattern is recorded in a predetermined angular range of an area where pits are formed in the subsidiary information area by overlapping with address information of the subsidiary information area, and in the area where pits are formed, an information layer in an area other than the predetermined angular range in which the BCA pattern is formed is in a crystalline phase.