CD-R Media Overburning
According to the redbook standard (the standard at which all CD.s are based on) the leadout must be 90 seconds. Usually you can even write beyond these 90 seconds but then the data may be unreliable.
PC TechGuide - Overburning
The Red Book standard for an audio CD specifies a capacity of at least 74 minutes plus a silent "lead-out" area of approximately 90 seconds, used to indicate the end of a disc.
Webopedia Quick Reference: DVD Regional (Country) Codes
DVD movies are usually coded with what is called a country or regional code or a zone lock. The three names, however, mean the same thing. DVD movies are given a regional code and the code on the DVD movie must match that of the DVD player to be viewed.
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