| 摘要 |
This manufacturing method of an information recording medium glass substrate is for manufacturing an information recording medium glass substrate which comprises a magnetic thin film layer formed on the primary surface of the glass substrate, and which is used in information recording mediums having a recording density on the magnetic recording surface of 600 Gbit/square inch or greater. When said information recording medium glass substrate has undergone alkali treatment involving immersion for 30 minutes in a pH11 sodium hydroxide solution at 40°C, the average SiOH/Si value on the primary surface of the glass substrate is 0.20-0.50. |
