rewind doesn't go all the way to the beginning of the program

the recording starts when you press the record button and ends at the end time of the program in the guide. many programs are available to watch via on-demand the next day so you can see the beginning of the program.

With X1, whenever you change channels, the buffer is cleared. Only one tuner is dedicated to live, so it cannot buffer anything on another channel. The old legacy boxes had 2 tuners, and each had their own buffer. You could sort-of do what you want by using the SWAP button to switch between tuners, with one pre-set to the channel you want to watch a bit later.

Could also add that if you know you are going to be a bit late starting to watch a live program, you can set it to record, then start watching the recording. You can watch while it records.

Thanks for your reply. Then, for the example above, I can't watch the segment between 10:00 and 10:04. I thought I could watch the beginning of the program as long as I went to that channel before the end (I thought DirecTV was that way). It's quite disappointing, but I guess I have to accept it.

Thanks for your reply also. I tend to notice a particular program AFTER it started, so that X1 or "legacy boxes" don't help me out. Again, this was a feature of DirecTV (I am not 100% sure, since I don't watch TV that much).