Interesting question. It never occurred to me to try that. I'll have to wait for some MPEG4 channels to become available again before I can test if the S3 can record them (I expect not). It can store the recordings, at least after a fashion, since I pulled some from the Premiere. And you can extract transport streams from the S3 (although you can't send them back), so it might be possible to pull them off again intact. But, even if it works, it doesn't seem terribly useful. I doubt that very much.