To improve capability for specifying an error position of a second error correction code in a data recording method, recording medium and reproducing device.

User data 109 are coded to N-word error correction code words 111 having a first error correcting capability, and control information 110a is made to be redundant by a control information redundancy circuit 101a and is coded to M-word second error correction code words 112 having a second error correcting capability. Then, the first error correction code words, the second error correction code words and synchronous signals 115 are interleaved to compose an L-frame recording frame, and a data stream in which the L frames continue is recorded to a recording medium, and when the control information 110a is made to be redundant, the whole control information 110 is made to be redundant so that the whole control information 110 may extend over a plurality of words of the second error correction code words.