I am ripping my blue ray collection to my hard disk and on my Back to the Future (25th Anniversary Edition) Part I disk, it created two files with ALMOST the exact same size. On file is 29,502,114 KB and the other is 29,502,113 KB. On the back of the box it says it is shown in 1080p Widescreen and 1080i, but how do I know which one is which? I tried watching the videos side by side and the viewing area looks exactly the same to me. Here are the videos side by side.