DVD and BD, etc.

http://en.wikipedia.org/wiki/DVD_plus_VR

http://www.ehow.com/how_5121020_format-dvdr.html

http://en.wikipedia.org/wiki/DVD-RW+RW http://www.dvdplusrw.org/Article.asp?mid=0&sid=1&aid=1,
http://www.tomshardware.com/reviews/dvd-burner-test,586-2.html

http://en.wikipedia.org/wiki/DVD-R, http://en.wikipedia.org/wiki/DVD+R

http://en.wikipedia.org/wiki/DVD-RW, http://en.wikipedia.org/wiki/DVD+RW

http://www.ehow.com/how_7271603_erase-dvd_r-disc.html,
http://en.wikipedia.org/wiki/DVD_recordable#DVD_write-once_formats

http://www.tomshardware.com/reviews/dvd-burner-test,586-2.html,
http://windows.microsoft.com/en-ca/windows7/burn-a-cd-or-dvd-in-windows-explorer

http://en.wikipedia.org/wiki/DVD-Rom#DVD_recordable_and_rewritable,
http://hometheater.about.com/od/dvdrecorderfaqs/f/dvdrecgfaq5.htm

http://en.wikipedia.org/wiki/MultiLevel_Recording,
http://en.wikipedia.org/wiki/DVD-Rom#Successors

http://en.wikipedia.org/wiki/Backward-compatible#Examples

http://data-loaf.blogspot.ca/2013/06/digital-video-cd-dvd-bd-etc.html