MAGNETIC DISK SUBSTRATE AND PRODUCTION METHOD OF MAGNETIC DISK

摘要

The invention can provides a production method of a magnetic disk substrate capable of controlling surface roughness and can reduce surface defects using only a polishing step, and a production method of a magnetic disk. When a glass substrate is polished, the glass substrate polished is with abrasive slurry containing abrasives. Next, the glass substrate is further polished with an aqueous rinse solution not containing the abrasives so that the surface roughness Ra of the glass substrate is 4 to 8 A.