MFDigital CD DVD Information Library: Lead-in/out and Program Area

MFDigital CD DVD Information Library

Thursday, June 10, 2004

Lead-in/out and Program Area

The area of the disc which contains data is divided into three areas:

Lead-in which contains digital silence in the main channel plus the Table of Contents in the subcode Q-channel. It also allows the laser pickup head to follow the pits and synchronise to the audio or computer data before the start of the program area. The length of the lead-in is determined by the need to store the Table of Contents for up to 99 tracks.
Program area which contains up to about 76 minutes of data divided into 99 tracks maximum.
Lead-out which contains digital silence or zero data. This defines the end of the CD program area.
This structure is identical for all types of CD whether for audio or computer data, although the data itself will vary.

This structure is identical for all types of CD whether for audio or computer data, although the data itself will vary.

- posted by J @ 3:48 PM

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