What is "disconnected network drive"?

I put in an external hard drive to help with my (unresolved) itunes issues. When I went under My computer I noticed my normal drives but also a F: drive called C on 'FITNESS(FITNESS)' (F. When I click on it, I get an error, when I check properties, it says Disconnected network drive File:NTFS 100% used. WHat i sthis and can an dhow do I get rid of it. Fitness is my wifes computer in the house, we used to have a network set up by XP. A while back I had to buy a new router and that I believe set up our network. I think the network is functioning, Are there 2 pathways? CAn I just get rid of this?