If it's anything like most of the high profile PC game releases we've seen this year, we aren't expecting a whole lot of the game to come on disc - an affliction Batman: Arkham Knight, Fallout 4, Metal Gear Solid V: The Phantom Pain, and Mortal Kombat X suffered from. In terms of hard drive space, you'll need around 38.5GB free to download the game, which on install needs 54GB.
Developer Avalanche Studios have put up the minimum and recommended PC configurations to play the game. Open-world action game Just Cause 3 is out next week.