Today, the PS4 version of Assassin's Creed: Odyssey was exposed, with rich content requiring 47GB of space. In comparison, the Xbox One version is 45GB and the PC version is 46GB.
47GB is actually quite large, but compared with the 105GB "Red Dead Redemption 2" exposed yesterday, the hard disk space occupied by "Assassin's Creed: Odyssey" is simply "not worth mentioning".
If you consider the later release of Call of Duty 15: Black Ops 4 (probably at least 50G), PS4 players will need to free up at least 47G+50G+105G=202GB of hard disk space for the new game this October. In addition, content updates and game patches will be launched after these three games are released, and the actual capacity may be doubled.
Of course you can also completely ignore Assassin's Creed and Call of Duty, just prepare for the "Big Mac" Red Dead Redemption 2.