The format is known as "DVD dash VR" or DVD-VR. Its actually known from the DVD specification as DVD-RTRW for real-time read/write. One thing that makes it different from the "DVD Video" standard which is used by professionally repliacted DVD's is that the indexing for DVD-VR is forward only. This allows the "writing" of the disc image immediately without having to come up with some cludge to try to write a fully index'd DVD Video file. Burnworld DVD-VR Info