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There are two ways to deliver your master to a disk replication facility: audio CD, or DDP file. While audio CDs work for this purpose, they are far from ideal, no matter how good the media and the burner are, there are still going to be a number of errors in the data. That's not the case with Disc Description Protocol, or DDP files, however. DDPs are delivered as data on a CD-ROM, DVD-ROM, Exabyte tape, or transmitted via FTP and are the industry-standard method for audio delivery files for replication.
The error correction implied by Disc Description Protocol is designed to be more robust than that of an audio CD. It ensures that the audio master received by the replicator will have as few errors as possible in the data.
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