Adding disk volumes to Windows 7?

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Is there a guide or writeup on how to add additional drives to a Windows 7 VM?  I have my VM up and running and wanted to add 4TB of space to a new drive in Windows.  I keep getting errors inside Windows, so I must not be doing something quite right.

 

I installed Win7 using the RedHat VirtIO drivers - the OS is installed to a 50GB OS drive.

 

When I add a 4TB disk image to the VM, it shows up in Windows 7 as x2 2TB drives.  I can't get them to combine to a single 4TB. 

 

Is there a driver or a specific way to set this up correctly?

 

Thanks!