High-density reproduction-only optical disc and method of recording and/or reproducing data on the same

A high-density optical disc comprising:

• a lead-in area;
• a user data area;
• and
• a lead-out area,
• wherein:
• disc related information is recorded as high-frequency groove wobbles on at least one of the lead-in area and the lead-out area,
• data of the user data area is recorded as pits, and
• a capacity of the optical disc is at or above 20 gigabytes.

A recording and/or reproducing apparatus for use with a recordable and a reproduction-only optical disc having a common format for indicating disc related information and data, the apparatus comprising:

• a pickup unit to record and/or reproduce the data with respect to a received one of the recordable and the reproduction-only optical discs;
• a signal processing unit to process a signal received from the pickup unit;
• and
• a controller to control the signal processor and the pickup unit to record and/or reproduce the data with respect to the received optical disc,
• wherein:
• the apparatus is compatible with both the recordable and the reproducing-only optical discs,
• each of the recordable and the reproducing-only optical discs comprises a lead-in area, a user data area, and a lead-out area, and
• disc related information is recorded as high-frequency groove wobbles on at least one of the lead-in area and the lead-out area,
• the data is recorded in the user data area as pits, and
• a capacity of the recordable and the reproducing-only optical discs is at or above 20 gigabytes.