SYSTEM FOR STORING AND/OR REPRODUCING INFORMATION

摘要

The disclosed system comprises a disc-shaped record carrier (1) and a device for reading and/or writing information in a track (9), which information is represented by marks constituted by bit cells having a constant bit length B1. For indicating the track (9), the record carrier (1) may be provided with a servopattern (4) in which a winding number is coded per winding (3) of the track. In the system, the ratio between the track pitch and the bit length is determined in such a way that the increase of the length corresponds from winding to winding to an integral number of bits. This provides the possibility of computing the position of an information block somewhere in the track from the ratio and the winding number in a simple manner and with great accuracy, because no rounding errors are produced when a computation using integers is performed. The device is provided with clock means (30) for generating a bit clock synchronously with the bit cells during scanning of the track, which clock means are adapted to generate the bit clock in a predetermined relation with the track pitch Tp, such that m * B1 = n * pi * Tp, in which n and m are integers which are larger than or equal to 1.