i'm building a new gaming computer and I'm going to use windows 10 as the OS, i bought a Samsung 250Gb 850 evo ssd that I want to use as the boot drive. I want to make 2 partitions on the drive a 90Gb and a 160Gb split so i can use the 90GB for the OS and the 160Gb for any games i want to load fast. Do i need to pre-partition the drive before i install the OS or can i plug it in and partition it during the OS installation?