Information data recording/reproducing method

Abstract

An information data recording/reproducing method correctly reproduces information data from a recording disc on which high density recording is performed through implementation of an increased linear density and a narrower track pitch. Each of recording data recorded at each of (m×n) recording points existing on n adjacent recording track (n is a natural number equal to or larger than two) including a target recording point and existing on m adjacent disc radial lines (m is a natural number equal to or larger than two) including the target recording point is subtracted from information data to derive a subtraction result. A residual operation is performed on the subtraction result to derive a residue value which is recorded at the target recording point. Recorded information is simultaneously read from (m×n) recording points existing on n adjacent recording tracks and existing on m adjacent disc radial lines to produce a read signal. The information data recorded at one recording point is recovered on the basis of the read signal to derive reproduced information data.