ALL the OS and applications should be on a SMALL drive.
ALL your personal files should be on the 1 TB drive.
DO NOT mix personal files onto the OS drive, keep it separated.
Set the SMALL drive to boot first in the bios set up.
Otherwise your system will run too slow. 1 TB drive is extremely slow.
That being said:
click system properties
click device manager
point at disk drives, right click
left click on scan for hardware changes
restart the computer, that should detect the new drive.