A combining structure for shelves has a plurality of bearing portions, connecting rods integrally connected to the periphery of each bearing portion, and each connecting rod extends toward the storage space to form at least one joining end. In one embodiment, a first substrate is a n\u03bb waveplate and the second substrate is a \u03bb waveplate. Alternatively, the backside of the patterning means may be polished to optical flatness and bonded by crystal bonding to an optically flat surface of a rigid mounting body. During the second probing, a second laser beam having a second wavelength different from the first wavelength is projected on the sample integrated circuit structure. Therefore, it is possible to provide a magnetic recording and reproducing apparatus having the magnetic recording medium that can suppress degradation of the servo signal caused by the thermal fluctuation of magnetization of perpendicular magnetic recording layers forming a convex-concave structure in the servo area to thereby ensure a stable servo function over the long term.