A glass substrate was used in the fabrication of the original optical memory disks, such as CD and CD-ROM. Because of pinholes and corrosion with conventional silvering, electroless nickel film was substituted. A glass disk is a non-conductor; therefore, a conductive surface treatment must be applied before electroforming. Conventionally, vacuum coating, sputtering and silvering are used for initial metallization on the glass disk. When these dry processes are used, pinholes in the substrate occur frequently. Also, deposited silvering film is fragile and corrosion resistance is low. Accordingly, electroless nickel film was applied to the glass memory disk.
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