abishek, a DVD movie which is say on a 4.7 GB DVD contains in general 4 VOB files. its max size being 1GB(shown as .99 GB). if u were to copy the DVD to ur hardisk u cud either take an image of your DVD movies using softwares like alchohol 120% or clone DVD or if u think its region protected/other protections, use 1 of teh many softwares available for taking image removing the protections...
if u r considering the space, then wat digital_brat said.. u cud do that.... i prefer using auto gordian knot for ripping... u can google to get the software and also tutorials reg. how to rip the movie. use a 2-pass proc. gives good results! thou it takes more time..
now, if this is wat u meant, then reg. the confusion with .vob files... all VOB files contribute to a movie(if the DVD contains only 1 movie). so if u were to play different vob files they play different parts of the same movie. u can use powerdvd to play the vob files separately. in case of 2 or more movies in a single dvd, its likely to get confused.. and u cud either check for the file name which wil be same for 1 single movie and different for the other movie containing vob files.
/legolas
