Glass substrate for magnetic media and method of making the same

摘要

A glass substrate and method for making the substrate. A sheet of glass is formed by floating molten glass on a molten material such as tin. The sheet is cut into smaller pieces which are then cut into circular blanks. An inner opening is formed in the blank. Other steps such as sizing cuts and chamfering of the inner and outer diameter may be performed. The blanks are ground or polished only a minimal amount or are not ground or polished, thus providing for economical manufacture. Various cleaning and chemical treatment steps may also be performed.