I'm just figuring out how to transfer Tivo programs burned to dvd-r discs onto my Seagate external hard drive. I've noticed that I can save the disc as either an ISO file to my computer, then copy the ISO file to the Seagate, or I can copy the program from dvd-r disc directly to the Seagate as a VIDEO_TS file (thus saving the extra step of copying to my computer first). I want to save these shows to my hard drive so I can stop using dvd-r discs and use rewritable discs, but I want to be able to burn them to disc later if desired. I've burned both the ISO file and VIDEO_TS file to a blank disc and believe the quality to be the same. Is there any advantage to saving these programs as either ISO files or VIDEO_TS files? I assume there's no difference, but I wanted to ask. Thanks.