Unable To Back Up My Copy Of Lonesome Dove

This Movie Has 4prats With 20 Chapters Per Part Anydvd Only Sees First Part And 3rd Not2nd Or 4th Part Need Help

Same thing happened to me. Wasnt sure how to fix it. I know this will not go over well but I used dvd decrypter, and dvd shrink and worked great. I know this is not the desired answer but it works.