There are five distinct types for a standard red beam DVD: DVD-ROM, DVD-R, DVD-RW, DVD+R, and DVD+RW.  The ROM is a commercially produced disc, it can’t be altered by the end-user. DVD-R and DVD+R are two different manufacturer standards, both will play commercial discs, but they won’t play discs made on or for the other manufacturer. The -RW and +RW d < Read full article..>