Internal & External Hard Drive

I've got an 2TB external hard drive on my iMac. Right now, the two different hard drives (internal and external) are being treated as two separate computers sharing a monitor. I have to shut down one to access the other. Is there anyway I can log into one hard drive and use the second one as auxilary? Make them work together?
I will say now that I've upgraded to Lion, I can "see" the other hard drive whereas before with Snow Leopard, the two hard drives couldn't "see" one another.
How do I do this?

Okay...I did that and included Show>Connected Servers just for good measure. Some programs will work across the hard drives and some programs won't. I haven't tried all of them so I don't have a complete list of what will and what won't work.
For example, I opened a Word doc and altered it, the change was saved in both drives. But my financial software won't allow me to work on it from either drive. It's a permissions thing.
I'm trying to get back to using the internal hard drive as primary and just using the external for extra storage. The internal was running out of space so I bought the external and couldn't get the two to work together. That resulted in my ending up using the external as the primary so everything is over there now.

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