DATA MEDIUM AND RECORDING/REPRODUCING DEVICE Russian patent published in 2014 - IPC G11B7/45 

FIELD: physics.

SUBSTANCE: invention discloses a data medium and devices for recording, reproducing and evaluating the data medium. The data medium has a region for recording the recording condition where the condition for recording a data sequence on a track is recorded. The position where the record mark to be formed on the track based on the recording condition is a first record mark, when the length of the first record mark is longer than a given length, the recording condition is classified using a combination of the length of the first record mark and the length of a first pause lying immediately before or after the first record mark. When the length of the first record mark is equal to or shorter than the given length, the recording condition is classified using a combination of the length of the first record mark, the length of the first pause and the length of a second pause not lying next to the first pause, but next to the first record mark.

EFFECT: reduced probability of error in reading information recorded with high density.

19 cl, 48 dwg