| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of producing a highly smooth substrate that is necessary for a magnetic disk substrate of high recording density, and particularly of high recording density of 50 G bit/inch<SP>2</SP>. <P>SOLUTION: The method of producing the magnetic disk substrate comprises a step of feeding a grinding liquid composition A containing colloidal particles having a volume average particle diameter of 0.005 to 0.1 μm, to the substrate, grinding the substrate with a main machining pressure of ≥6 kPa, and thereafter grinding the substrate with a machining pressure of 20 to 80% of the main machining pressure. Alternatively the method comprises a step (step 1) of feeding a grinding liquid composition B containing colloidal particles having a volume average particle diameter of 0.005 to 0.1 μm, to the substrate, and grinding the substrate with a main machining pressure of ≥6 kPa, and a step (step 2) of feeding a grinding liquid composition C containing colloidal particles having a volume average particle diameter of 0.005 to 0.1 μm, to the substrate obtained by the step 1, and grinding the substrate with a machining pressure of 20 to 80% of the main machining pressure in the step 1. <P>COPYRIGHT: (C)2007,JPO&INPIT |
