To enable exact tracking and to suppress an increase in crosstalks with an overwritable phase transition type optical recording medium by attaining a higher recording density and suppressing the increase in cross erasure.
This method executes recording and reproducing with the phase transition type optical recording medium which has grooves across lands on the surface of a substrate having a thickness of ≤0.8 mm and uses the lands and the grooves as recording tracks. The method executes overwriting under the conditions under which recording power Pw[mW] and erasing power Pe[mW] satisfy (Pw/Pe)xk2≤8.5 when a recording track pitch is defined as P[μm], the numerical aperture of a recording and reproducing optical system as NA, the wavelength of the recording and reproducing light as λ[μm] and when k=(λ/NA)/P≥1.78 is set.
KATO TATSUYA
INOUE HIROYASU
