Magnetic disk substrate and production method of magnetic disk
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United States of America Patent
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May 12, 2009
Grant Date -
Nov 15, 2007
app pub date -
Aug 26, 2005
filing date -
Aug 27, 2004
priority date (Note) -
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Abstract
The invention can provide a production method for a magnetic disk substrate capable of reducing the number of surface defects of a glass substrate. When a magnetic disk is produced by using the resulting magnetic disk substrate, the yield and, furthermore, the reliability can be improved.When a surface of a magnetic disk substrate is washed after it is polished, the glass substrate is dipped into a washing solution while the surface of the glass substrate polished is held under a wet condition. The wet condition of the surface of the glass substrate includes a condition in which the glass substrate is dipped into water that may contain a surfactant, and a condition in which a liquid film is formed substantially on the entire surface.
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