CD Replication is the original, traditional method of manufacturing a Compact Disc from raw materials. This is a true manufacturing process, and therefore it is best for longer runs of 1,000 or more units.  The minimum quantity for Replication is 500. Standard turn times for Replication are:

10 business days

7 business days + $150

5 business days + $300

For an in-depth look at how CDs are made: http://en.wikipedia.org/wiki/Compact_Disc