Yes. The buffer can often contain more than the 30 minutes that's available from the normal Live TV 30 minute playback buffer that we see. As soon as you choose to record the show, the hidden part of the buffer is added to the new recording. In fact, you do not have to rewind first - all you're doing is losing part of this hidden buffer. You should immediately press Record without bothering to rewind at all. The caveat with the record from buffer feature, of course, is that if the show's ending time has been reached, then you will wind up recording the next show, even if it just started seconds before you chose to record. (You may wind up with some part of the old show tacked on to the next show, however).