Thank you for the helpful response. I used the 'Create image file from files/folders'. Some questions:
1. Why does Imgburn create a MDS file for some ISO's, but not all? Why does it choose certain DVD's? Is it important to keep or can be deleted?
2. Is there any difference between an ISO or a BIN/CUE created using 'Create image file from file/folders'?
From my limited knowledge I think BIN saves an entire disc, all sectors, hidden, etc., but the 'Create Image file from files/folders' simply adds files so there is no difference between ISO and BIN, right?
I should also note that my main objective is to preserve these DVD's in case they become damaged or corrupted. They are important videos such as wedding.
Thank you.
Edit: Ok so I tried to do a BIN to compare, and Imgburn did not create any CUE files. This is quite strange. It's making MDS with ISO's, and making BIN's with no CUE.
Edit 2: Those ISO's with MDS files, when creating a BIN, it creates a MDS file. Btw, I haven't touched any setting in Imgburn, everything is the default. Really strange.
Edit 3: Another werird thing... the ISO and BIN's are 100% identical in size. It seems the only difference is the extension.
Edit 4: More weirdness... the ISO and BIN show a region error for one of the DVD's. Since DVDFab made the same error, I'm assuming the video transfer company made some mistake. But I do recall when Imgburn created the files it showed Region 1-8 and NTSC. VLC player plays it without a problem, so no biggie but just curious how this happens.