Patent ID: 8159922

Claim:
A recording medium comprising: a control data area including at least a lead-in area and/or lead-out area; a user data area; and a BCA, separated from the control area and located inner the control area, storing information associated with a length of a mark or space of data to be recorded or recorded in the control data area and the user data area, wherein control data in the control data area and user data in the user data area are formed by a same modulation method, but different mark and/or space structure, wherein a different processing is required according to the different mark and/or space structure, wherein length of a minimum mark or space in control data area is at least two times with respect to that of a minimum mark or space of user data area and wherein an optical transfer function in the control data area is different from that of the user data area due to the different mark and/or space structure.