i just burned the movie office space onto a dvd-r disc and it didn't need any compression. on the playing side of dvd there was a narrow ring that all the way around the disc. is this just the space leftover from the burn since there was no compression or did i do something wrong? also, i guess i don't need dvd shrink when the movie fits on the 4.7 blank. but i thought i used it for something that time. do i just need to use decrypter?