DVDs On DAT?

Guppy06 asks: "The big question about copying DVDs (other than legality) seems to be "What do you do after being able to decode it?" A cursory scan of Pricewatch shows that DAT tapes are now big enough to hold the entire contents of a DVD and then some. I know that tapes in general have been relegated to the back-up role because of their slow search times and, to some extent, slow read/write times. However, you don't exactly need ATA-100 (or even a 12x DVD-ROM) to watch DVD-quality streaming video from start to finish. So, my question is 'Would it be possible?' If not, what's standing in the way, and are those problems long-term or short-term? How fast are read/write times on DATs increasing, if any? DATs are an ancient technology (by computer standards), widespread, cheap, and not easily censorable in the near future. It might be a better alternative to bending over for the MPAA for playing/recording large media files." As long as the data transfer rate is sufficient for real-time playback of a DVD, I don't see why something like this can't be done. Of course you will lose the searching capabilities (playback in a differing speeds both forwards and backwards), but when you are just playing a DVD, do you really need those?