Ok I unplugged the other one and all that is left is the WDC one. I ran a quick test and it passed, running the extended one now. So for it says smart status has passed. I'm guessing it is damaged since its capacity is at 320 GB and it was a 1 TB drive.
Your External USB hg is a 1 tb
Your internal hd the wdc3200bevt is a 320gb
Unless i am wrong you unplugged your usb drive (itb) and are testing your wdc3200bevt drive so it is ok that it shows 320gb as its capacity.