Lead-out

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The lead-out is a final mark for compact discs (CDs), digital versatile discs (DVDs) and Blu-ray discs (BDs) after the data area and thus defines its end. It is the counterpart to the lead-in in front of the data area.

According to the Redbook standard for audio CDs, the lead-out length for CDs is 90 seconds. With multisession CDs , the length of the 2nd and subsequent lead-outs is 30 seconds. The content of the lead-out is, in the case of audio, absolute silence or, viewed digitally, all zeros. The lead-out also serves as an indicator for the reader for the position of the scanning beam. Should this reach the lead-out, the reader knows its position (end of the data area) and can thus guide the scanning beam back to the data area.

If there are several sessions on a CD, each session ends with its own lead-out.

With the disc-at-once burning process, the entire content of the CD-R (W), consisting of one or more sessions, is burned in the order lead-in, data area and lead-out. The areas are burned in the order in which they appear on the CD-R (W). With the session-at-once method, a session is placed on the CD-R (W) in the sequence lead-in, data area and lead-out. With the Track-At-Once method, only one track is burned. Only after all the desired tracks of the session have been applied are lead-in and lead-out burned in a separate step, finalizing .

Web links

  • Johnny Graber: CD Burning Basics. In: SelfLinux-0.12.3. Retrieved May 30, 2019 .
  • Dietrich Boles: The Compact Disc. In: Book accompanying the lecture multimedia systems. July 14, 1997, accessed May 30, 2019 .