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CD replication is a great way to make terrific-sounding copies of a CD. The process works by taking an original, making it into a glass master, then pressing the master to create perfect copies. These discs are recognizable by their silver bottom, like store-bought CDs. Whereas, duplicated CDs are recognizable by their greenish bottom, like blank CDs you find at office supply stores.
Replication vs. Duplication. One process isn't necessarily better than another, and both will last for years. For shorter runs, however, CDs are typically duplicated to eliminate the step of making a glass master.