| 摘要 |
PROBLEM TO BE SOLVED: To provide a glass substrate for magnetic recording medium having ultra fine surface roughness and its manufacturing method and to provide a magnetic recording medium excellent in high recording density by using the glass substrate obtained. SOLUTION: The glass substrate having ultra fine surface roughness is manufactured by using a mixed liquid of water, abrasive grains and potassium hydroxide and further a mixed liquid of water and potassium hydroxide as a grinding liquid in a stage for grinding the surface of the substrate included in the method for manufacturing the glass substrate for magnetic recording medium, and the magnetic recording medium excellent in recording density is manufactured by using the glass substrata.
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