Manufacturing method and manufacturing method of a magnetic disk of the magnetic disk glass substrate

The present invention provides a process for producing a glass substrate for a magnetic disk which can be finished end surface of the glass substrate with high accuracy the shape and quality. A first processing following the end face processing process for processing the end surface of the glass substrate in the present invention, performed by a second process performed as a preceding process. The first processing is processing in a state in which a magnetic slurry containing abrasive grains and magnetic contacting the end face of the glass substrate to a mass of magnetic slurry which is formed by holding the magnetic force lines. The second process, using a grindstone having a formed groove shape so as to be able to process both surfaces of the side wall surface and the chamfered surface of the end face of the glass substrate at the same time, a glass substrate with respect to the direction of groove shape of whetstone processed in a state in which the inclined.