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Gold CDs and silver CD
Feb 14, 2017

Gold discs, also known as a CD-r disc, on a blank disc is covered by a thin reflective layer of gold. Silver disc, also known as a commercial copy CD, with a thin layer of aluminum. Because different coating methods, physical appearance, especially in color, in between these two types of CD are different. Gold CD can be used as a blank recordable media, you can use a CD recorder to write data and music signals to a gold disc, and a silver disc cannot be used as a recording medium, because the data has been compressed into the polycarbonate. Silver CD's life span is about 25 gold discs is 70--100 years. This fact points out that their different purposes: silver disc is for data transfer and commercial copies, and gold discs are ideal for data archiving.

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