Windows won't see it until it's initialized. And to use it for storage, you must format it. There are many ways to do that, here is one tutorial.
I installed a new 3.5" hard drive. How do I get the computer to recognize the new hard drive? I currently have the 500GB installed that I bought with the system, but it is near capacity. The new SATA drive is 1.5TB, and Dell told me that is the maximum it can be (2TB in total). But now that I installed it correctly (BIOS sees it), I can't get Windows to "open" the drive so I can start using it. Help!!
I installed a new 3.5" hard drive. How do I get the computer to recognize the 
new drive?