Well when windows is on there a lot of ther basic programs get installed there as well and I would leave them there , like browser , , excel , word etc . This way they boot up extremly fast and working with them is easy . On your HDD you put data , like pictures , movies or music . You can also put most games there that don ' t need such high bandwidth , like some older games and smaller games . For example SSD Put games like Witcher 3 , Battlefield 1 , Rainbow 6 Siege , big MMOs and open world games like GTA on thereHDD Put games like League of Legends , smaller indies , Civ 6 on there . In the end you can always try them first on your HDD , and move them over to the SSD later down the line when you see they load just too slow . Since you only have 250 GB , you ' ll have to make descisions . I would value Multiplayer games over Singleplayer . In BF 1 , you almost capped the firstflag when others on older HDDs are finished loading the map . When you want to go into video or picture editing , put those programs on the SSD as well to benefit from the speed .