Information recording medium, and apparatuses for recording and reproducing thereof, and methods for recording and reproducing thereof

摘要

An information recording medium is at least composed of a substrate (13), a second recording layer (12Y), a second light transmitting layer (11Y), a first recording layer (12X) for recording different information from that to be recorded in the second recording layer, and a first light transmitting layer (11X). The second recording layer is formed with a second microscopic pattern that is composed of continuous substance of grooves. The first recording layer is formed with a first microscopic pattern that is different from the second microscopic pattern, which is composed of continuous substance of grooves. Both sidewalls of raised portions of the first and second microscopic patterns are formed with wobbling so as to be parallel with each other. An auxiliary information and a reference clock is recorded on these sidewalls alternately and continuously.