I Can't get my Newly-Built Computer to See the Second Drive

Here are the specs of my new build: i7 2600K CPU, 8GB 1600 DDR3 Ram, Quadro 600 GPU, Hitach 500 GB Boot Drive, WD 1.5 TB media storage. The computer is up and running on Windows 7 Ultimate.

So when I go Start > computer, under Hard Disk Drives it only shows the Boot (C) Drive w/ 465G total size. Same deal when I have a document to Save, it only gives me the C Drive as an option. But, when I go Start > Control Panel > Device Manager and twirl down Disk Drives, it shows both the Hitachi 500GB and the WD 1.5TB. I double-click on the WD and on the General Tab it says "This device is working properly".

I went into the BIOS and it doesn't show the second drive either.

There must be some "enable" button that I'm missing, but where is it?

Thanks for your help,
Tim