US Patent 7693029 Recordable optical disc

A recordable optical disc (1, 1′, 1″, 100) comprises at least one user data area (12) for storing user data, and at least one controlling data area (6, 8, 10, 11) for storing controlling data necessary for accessing stored user data and/or for recording user data into a user data area (12), wherein at least a part of the physical structure of the optical disc corresponding to at least a part of at least one controlling data area (6, 8, 10, 11) and/or to at least a part of at least one user data area (12) has a modified physical structure (118, 120, 122, 123) which is arranged such that a standard optical disc recorder cannot record user data into at least a part of at least one user data area and/or controlling data area (6, 8, 10, 11).