Use lawena to record it and select the "killnotices only" hud.
Use google to find out how to use lawena, there are several guides around.
Thx
Btw the size of lawena is so big, before i done recording, my computer has out of spaces
Any other recording tools similar to lawena??
At what fps did you record? Choose 60fps, that will decreased the space it takes up by a lot. Also, after you're done with the video, you will get all your diskspace back if you delete the segments.
And if your disk is still too small, Fraps I guess.