If you're planning on buying Titanfall then you should probably make sure that you have got 48GB free space on your hard drive come release on March 11th.
Vince Zampella has responded to a question on twitter about the final install size of the game.
He responded by saying that it will be a 48GB install with 21GB to download.
@Ahmed_Zainal approx: 21gb download, 48gb installed.— Vince Zampella (@VinceZampella) February 24, 2014
I think those of you that are struggling for space at the minute are going to have to do some serious nuking of your Steam library if you want to fit that on there.
Thanks, PC Gamer