Abstract: A data storage system (1) comprises: an optical disc (2) having a physical storage space (3) comprising two layers (L0; L1) of physical storage locations, the physical storage space comprising a logical storage space (LSS) which contains storage locations within a first layer (L0) and within a second layer (L1), the storage locations in said logical storage space having contiguously numbered logical addresses (LA); a disc drive (10) capable of writing information in the logical storage space of said optical disc; the disc drive having an address limit memory (12), containing at least a value for a parameter LAmax indicating the maximum value of said logical addresses of the storage locations (4) in said first storage layer (L0); the disc drive (10) being capable of changing the value in said address limit memory (12); and a host device (20), capable of cooperating with said disc drive (10).