A recording medium and a method for recording a signal on the recording medium having a first frame and a second frame, the first frame including a first synchronous pattern (23,24), a second synchronous pattern (25) that follows the first synchronous pattern and first data (25-33), the first data being modulated into RLL code, the second frame including the first synchronous pattern (41,42) and second data, the second data being modulated into the RLL code, one sector of the recording medium being composed of at least one first frame and a plurality of second frames, wherein a pattern that includes the maximum code inversion length of the RLL code and that does not correspond to a modulation rule of the RLL code is recorded as at least part of the first synchronous pattern, and/or wherein a first pattern that includes a plurality of successive sequences of the minimum code inversion length of the RLL code and that does not correspond to a modulation rule of the RLL code is recorded as at least part of the second synchronous pattern.