Reproduction apparatus and method for reproducing a unique medium identifier

Recording apparatus for recording a unique identifier ID on a record carrier (5), said record carrier having a data area for storing data and a defect management area for storing data reallocated from defective sectors of said data area and for storing a reallocation information, comprising:

• a recording means (1, 2) for recording a first data unit at a first non-defective sector in said data area and for recording a second data unit at a second sector in said defect management area, and
• a reallocation means (3) for recording a reallocation information in said defect management area marking said first sector as defective and as reallocated to said second sector, said first data unit and said second data unit being provided for evaluation by comparison and/or combination and for deriving said unique identifier ID from the result of said evaluation.

Recording method for recording a unique identifier ID on an optical record carrier (5), said optical record carrier having a data area for storing data and a defect management area for storing data reallocated from defective sectors of said data area and for storing reallocation information, comprising the steps of:

• recording a first data unit at a first non-defective sector in said data area
• recording a second data unit at a second sector in said defect management area, and
• recording a reallocation information in said defect management area marking said first sector as defective and as reallocated to said second sector, said first data unit and said second data unit being provided for evaluation by comparison and/or combination and for deriving said unique identifier ID from the result of said evaluation.

Record carrier (5) having:

• a data area for storing data including a first data unit stored at a first non-defective sector,
• a defect management area for storing data reallocated from defective sectors of said data area, said data including a second data unit stored at a second sector, and for storing reallocation information including an information marking said first sector as defective and as reallocated to said second sector, said first data unit and said second data unit being provided for evaluation by comparison and/or combination and for deriving said unique identifier ID from the result of said evaluation.