There are five recordable versions of DVD; DVD-R for General, the walking dead box set for Authoring, DVD-RAM, DVD-RW, and DVD+RW. None of the formats is fully compatible with the other although there are drives which will read, and in some cases write to more than one format.

DVD-R for General and DVD-R for Authoring are essentially  Buffy The Vampire Slayer Box Set versions of CD-R. And DVD-RW is a DVD version of CD-RW. All three formats can be read in standard DVD-ROM drives and in most DVD video players. The difference between DVD-R for General and DVD-R for Authoring is that DVD-R for General is a format intended for widespread consumer use and doeasn’t support ‘professional’ features such as piracy protection or duplication in mass duplicators.

The Pioneer DVD-RW drive which is the most popular PC device for writing to  South Park Seasons 1-15 DVD Box Set uses the DVD for General format. And as as the case with CD, DVD-RW is essentially the same as DVD-R except that it can be erased and written to again and again.