| http://www.w3.org/ns/prov#value | - The present variation can be manufactured in the same way as for the magnetic disc X shown in FIG. 1, except e.g. that in the step described earlier with reference to FIG. 3(a) as a step of forming grooves 11 which correspond to a plurality of thermally conductive linear regions 3, grooves 11 belonging to a radially more inward group are formed wider than those belonging to radially more outward g
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