Abstract: A method for the production of a glass substrate for magnetic recording mediums comprises the steps of sandwiching an abrasion board for correction between upper and lower surface tables of a both side-polishing device for polishing the glass substrate, while these upper and lower surface tables are fitted to the polishing device, rotating the upper and lower surface tables in the opposite directions while supplying cooling water to thus polish the surface of these tables to a flatness of the table surface on the order of not more than 30 &mgr;m; then adhering abrasion cloths to the upper and lower surface tables, respectively; thereafter repeatedly polishing the surface of the glass substrate for magnetic recording mediums. The production method permits the efficient production of an excellent glass substrate for magnetic recording mediums.

Abstract: A method for the production of a glass substrate for magnetic recording mediums comprises the steps of sandwiching an abrasion board for correction between upper and lower surface tables of a both side-polishing device for polishing the glass substrate, while these upper and lower surface tables are fitted to the polishing device, rotating the upper and lower surface tables in the opposite directions while supplying cooling water to thus polish the surface of these tables to a flatness of the table surface on the order of not more than 30 &mgr;m; then adhering abrasion cloths to the upper and lower surface tables, respectively; thereafter repeatedly polishing the surface of the glass substrate for magnetic recording mediums. The production method permits the efficient production of an excellent glass substrate for magnetic recording mediums.

Abstract: A method for the production of a glass substrate for magnetic recording mediums comprises disk-processing, grinding, polishing and cleaning steps and the method is characterized in that the grinding step is carried out using a cooling liquid and a both side-grinding device for grinding a glass substrate for magnetic recording mediums, in which thin plate-like nonferrous metal-bonded grinding wheels, resin-bonded grinding wheels or vitrified bonded grinding wheels, containing abrasive grains are adhered to the surfaces of the upper and lower surface tables of the device. The method for the production of a glass substrate for magnetic recording mediums permits the easy and efficient production of a glass substrate for magnetic recording mediums, the method does not require the use of any multistage cleaning stage under the application of ultrasonics and any acid-cleaning stage and it can thus eliminate the possibility of any contamination.