Stiffs :
All i did was change the boot up priorety to my new ssd 256gb, The games did i uninstall from the old disk and then went on to steam and chose to install them on my new disk (A), So i didnt copy the files no. I dont know what it boots from, but i chose the new one.
The "boot priority" means nothing if there is no OS on that drive to boot from.
The Bios goes down in order:
First option - Is there a viable OS to boot from? Yes, do that, No? Move Next
Next Option - Is there a viable OS to boot from? Yes, do that, No? Move Next
Repeat until it sees a drive with an actual bootable OS on it.
It is still booting from the original smaller SSD.
And don't give your new drive, or any drive, the drive letter of A or B. Yes, it works. But it is not optimal.