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).