) ▁files : ▁ ▁V TS _ 0 1 _ 0 . I FO ▁file : ▁stores ▁control ▁and ▁play back ▁information ▁for ▁the ▁Video ▁Title ▁Set ▁ 0 1 — e . ▁g . ▁information ▁about ▁chap ters , ▁subt it les ▁and ▁audio ▁tracks . ▁A ▁" V TS _ zz _ 0 . I FO " ▁file ▁( where ▁" zz " ▁is ▁from ▁ 0 1 ▁to ▁ 9 9 ) ▁is ▁required ▁to ▁be ▁present ▁on ▁each ▁V TS . ▁ ▁V TS _ 0 1 _ 0 . B UP ▁file : ▁a ▁backup ▁copy ▁of ▁the ▁V TS _ 0 1 _ 0 . I FO ▁file . ▁This ▁file ▁is ▁required ▁to ▁be ▁present ▁on ▁a ▁DVD - comp li ant ▁disc . ▁It ▁is ▁part ▁of ▁Video ▁Title ▁Set ▁( V TS ). ▁ ▁V TS _ 0 1 _ 0 . V OB ▁file : ▁Video ▁Title ▁Set ▁ 0 1 , ▁Video ▁Object ▁ 0 , ▁contains ▁the ▁menu ▁for ▁this ▁title . ▁This ▁file ▁is ▁not ▁required ▁to ▁be ▁present ▁on ▁a ▁DVD - comp li ant ▁disc . ▁ ▁V TS _ 0 1 _ 1 . V OB ▁file : ▁Video ▁Title ▁Set ▁ 0 1 , ▁Video ▁Object ▁ 1 , ▁contains ▁the ▁video ▁for ▁this ▁title . ▁At ▁least ▁one ▁file ▁" V TS _ zz _ 1 . V OB " ▁is ▁required ▁in ▁the ▁V TS ▁and ▁each ▁" V TS _ zz _ x