Rewritable storage medium data

A storage medium Rewritable data (1), having a layer rewritable recording (9) provided with a tracking structure (8) having tracks, said layer (9) a recording area data (5), and a mark erasable identification (3) forming a bar code, written using the same property change or the reverse of the recording layer used for recording user data, and is present in an area of identification mark (4) other than the recording region data (5) and extending along a radial width corresponding to the radial width of several tracks of tracking structure (8) in the recording area data (5), wherein the recording region data (5) has a first tracking structure (8 '), while the area identification mark (4) has a second tracking structure (8 ") modified with respect to the first tracking structure (8 ' ).