Reproducing system and corresponding information recording medium having wobbled land portions

摘要: An information recording medium is at least composed of a substrate having microscopic pattern constituted by continuous grooves formed with groove portion and land alternately, layer on the for information, light transmitting layer. The satisfying relation P≦λ/NA, wherein P pitch or portion, λ wavelength reproducing layer, NA numerical aperture an objective lens. wobbling so as to be parallel each other both sidewalls portion. auxiliary based data used supplementally when reference clock controlling speed recorded alternately. Information in corresponding only either one change reflectivity difference refractive index more than 5% 0.4 modulated amplitude signal recording.