How to make my hard drive show in My Computer?

I just bought a western digital caviar black 1tb hard drive, I wanted to use this hard drive as a secondary hard drive to backup all my files. I currently have a 320gb hard drive as primary which is where the OS is Installed. (Win Vista Ultimate 32bit)

I plugged the 1tb hard drive in my computer and i checked Bios and is detected also in disk management is detected, but it just doesn't show in my computer, it only shows drive C: which is my 320gb disk.

I already formatted the disk but still doesn't show, do i forcefully have to partition the 1tb disk? I really want to keep it in one partition Not divided.

How can i make it show in My Computer? It must be a way, Please.