METHOD OF MANUFACTURING GLASS SUBSTRATE FOR MAGNETIC DISK, AND METHOD FOR MANUFACTURING THE MAGNETIC DISK

摘要

PROBLEM TO BE SOLVED: To provide a method of manufacturing a glass substrate for a magnetic disk that can obtain an excellent end shape, and a method for manufacturing the magnetic disk.SOLUTION: The method of manufacturing a glass substrate for a magnetic disk has a mirror-surface polishing step in which the surface of a glass substrate is polished by bringing a polishing pad into contact with the surface of the multicomponent glass substrate while supplying a polishing liquid containing polishing abrasive grains to the surface of the glass substrate and by relatively moving the glass substrate and the polishing pad. The mirror-surface polishing step is executed by controlling the agglomeration degree or dispersion degree of the polishing liquid so that a Duboff value indicating an end shape obtained by the mirror-surface polishing step of the glass substrate is within a range of ±10 nm.