Asking this for my brother. So my brother has a 128 GB SSD and a 1 TB HDD. All he can see is the SSD on the computer.. What does he have to do to make the computer detect both?
try to go on the "Computer" icon with a right click, after that go on manage. you will have a list at the right side of the window that opened, where you can choose to manage your data drives. click on it and you will most likey see the ssd in blue and something else in black. just right click the black area and tell it to format the drive so windows can handle it. after that, you should be done.
sorry for my poor explanation, i now exactly how to do this, and im doing this quite a lot of times at work, but never in english. hope you can still do it.
cheers