This is a question we are regularly asked so without getting too technical:
CDR Duplication:
The data contained on the original master disc is burned (duplicated) onto blank DVD-R discs. With smaller quantities, this is the most effective and cost efficient way of producing DVD copies.
CD Replication:
The content on the original master is transferred via a “Glass Master” to a Stamper, a metal disc which looks like an oversize CD. The discs are manufactured by an injection moulding process whereby this Stamper is introduced to hot, liquid polycarbonate, which is rapidly cooled so it hardens, thus creating the disc. A fine layer of aluminium is spread across the surface of the disc to create a reflective surface. Replication is the most cost effective way of producing larger quantities.
The question of compatibility is also raised regularly. A replicated CD will play on ANY CD PLAYER, ANY CAR STEREO, ANY RADIO STATION PLAYER, ANY PC, ANY WHERE!
Duplicated CDRs, however, are not quite so compatible, and older CD players may reject them.
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