DVD Players in 2003 Ford Expedition

I just picked up a 2003 Expedition with the DVD enterainment center included. I am trying to find out what media format will work in the DVD
player. I do not want to ruin my originals and when I made a copy with -R format, it did not work. Anyone have any insight on what format will work or if there is a modification I can make to the current system so backup copies will work?
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