I want recover files lost on dvd

hi there i need some help with my dvd.well I put some files (video and document) on dvd and now I cant read them Its like i lost them.When I put the dvd on the drive i can see the dvd name and a red line that show the dvd is full but when i try to open it is empty.

Try a program called ISOBuster to find and extract the files. There is a free version that you should try first.