Patent ID: 7972715

Claim:
A thermal-assisted magnetic recording disk comprising: a disk-like glass substrate; and a recording layer formed on a main surface of the glass substrate, the recording layer including a plurality of recording magnetization portions arranged in a concentric manner around a center of the glass substrate and a plurality of non-magnetization portions having a thermal conductivity lower than that of the recording magnetization portions, each of the non-magnetization portions being disposed between adjacent recording magnetization portions along a circumferential direction on the main surface of the glass substrate, wherein a mean squared roughness of a first area of the main surface of the glass substrate where each of the non-magnetization portions is formed is equal to or smaller than 1 nanometer, a width of each of the non-magnetization portions is between 30 nanometers and 140 nanometers, and a thermal conductivity of each of the non-magnetization portions is equal to or lower than one hundredth of a thermal conductivity of each of the recording magnetization portions and in a range from 1×10 −3 W/(m·K) to 1 W/(m·K).