I just got a Sandisk Ultra 2 960gb SSD so I could transfer my steam library to it and leave my 500gb 850 evo for OS and documents but i've run into a problem. In the Bios under BBS Boot Priorities it lists the Sandisk SSD and on board explorer it recognizes that it's plugged in but here is where it gets confusing for me. For the boot priority list it doesn't allow me to make Sandisk the second drive to be run on boot, just Samsung 850 Evo then UEFI Hard Disk (the only way my ssd got recognized originally when I built this computer was putting the computer on UEFI+Legacy Mode). So the Bios atleast knows i have this other SSD but when I boot up and log into windows (I have Windows 10) it doesn't show the second SSD in file explorer. What should I do?