Question about mac networking

[Keyser Soze]

I'm hoping Gooch or some other person familiar with macs might be able to help with this...

I've got file sharing enabled on my mac mini and i'm able to connect to the drive on the mini with my macbook, but i can't seem to see or connect to the USB drive i've got connected to it.

Is there anything i'm missing here?

I've already cleaned the scuzzi throughly, by the way.