". ▁DVD - Video ▁can ▁contain ▁up ▁to ▁ 9 9 ▁( 1 – 9 9 ) ▁titles ▁with ▁max ▁ 1 0 ▁( 0 – 9 ) ▁V OB ▁files ▁each . ▁The ▁last ▁possible ▁V OB ▁file ▁is ▁V TS _ 9 9 _ 9 . V OB . ▁ ▁... ▁etc . ▁ ▁I FO ▁files ▁store ▁control ▁and ▁play back ▁information — e . ▁g . ▁information ▁about ▁chap ters , ▁subt it les ▁and ▁audio ▁tracks . ▁They ▁do ▁not ▁store ▁any ▁video ▁or ▁audio ▁data ▁or ▁subt it les . ▁ ▁B UP ▁files ▁are ▁only ▁back ups ▁of ▁the ▁I FO ▁files . ▁ ▁Dom ains ▁ ▁Data ▁structures ▁recorded ▁on ▁a ▁DVD - comp li ant ▁disc ▁are ▁components ▁of ▁one ▁of ▁the ▁four ▁data ▁groups ▁called ▁domains : ▁ ▁First - play ▁( FP ) ▁– ▁First ▁Play ▁P GC ▁located ▁in ▁the ▁V IDE O _ TS . I FO ▁file ▁ ▁Video ▁Manager ▁( VM G ) ▁– ▁contains ▁V IDE O _ TS . I FO , ▁V IDE O _ TS . B UP ▁and ▁V IDE O _ TS . V OB ▁ ▁Video ▁Title ▁Set ▁( V TS ) ▁– ▁contains ▁" V TS _ zz _ x . I FO ", ▁" V TS _ zz _ x . B UP " ▁and ▁" V TS _ zz _ x . V OB " ▁files ▁( where ▁" x " ▁is ▁from ▁ 1 ▁to ▁ 9