SATA drive

So I have two hard drives and two DVD drives, and I wanted another hard drive. I got a SATA one, and installed it just now, but Windows doesn't recognise it. What to do?

In before stop using Windows.

That shouldn't be the problem. I run a SATA 2 drive on a SATA 1 controller, and it works just fine. They're made to be backwards compatible and fall back to the highest common mode.