When you or a mastering studio sends a CD-DA to a manufacturing plant, the plant has two choices when it makes your CD. They can either play the CD in real time directly onto a glass master or onto their server, or rip the audio using Digital Audio Extraction (DAE). Each method has drawbacks. Real time playback uses error correction for drop outs and must be properly clocked, while DAE pulls small segments of the audio files off the CD and then reconstructs them back together on the server. Although DAE has greatly improved over the last few years, it can be susceptible to seek errors and jitter, especially at high speeds.
A much better option is to deliver a DDP (Disc Description Protocol) file set. DDPâ€™s can be delivered on any media that a plant will accept, like CD-ROM, DVD-R, Jazz or hard drives. Manufacturing plants simply transfer the files onto their server the same way you would copy any computer data. The difference is that the DDP files are transferred using data redundancy. Every bit is accounted for. There is no ripping, no re-clocking and no error correction. When the files are copied to the plantâ€™s server they are exactly the same as they were on your computer.