This article is from the CD-Recordable FAQ, by Andy McFadden (firstname.lastname@example.org) with numerous contributions by others.
Nothing. This FAQ is about CD-R and CD-RW, and only crosses over into
DVD when the two technologies rub up against each other.
To learn more about DVD, see section (2-14) and read the DVD FAQ at
http://www.dvddemystified.com/dvdfaq.html. For DVD recorders, check
out the Usenet newsgroup alt.video.dvdr and perhaps rec.video.dvd.tech.