Fedora Networking :: Can't Access Shared External HDD?

I have a Belkin router with an external HDD attached to it through the USB port on the router. Every time I try to access it, I get a popup asking for the username, domain name, and password. I have no idea how to gain access to it in Fedora. I can access it fine with windows XP and 7, but get the login screen when using Fedora. I can access my shared files on the xp machine just fine with fedora, but not the external on the router. Do I need to do some extra configuring with samba to get it to work? What is my domain password anyway, I don't ever remember setting one up? Is there a way to find out and just plug it in when the login screen pops up? I am clueless, I tried searching, but everything I come up with involves vpn, which I am not using. If it helps, I sometimes get a similar login screen in windows as well, usually when I first log into either my xp machine or my 7. Its not every time I log in, but it does occasionally happen, I have no idea why. Networking is just not my forte. What I do to get around it is go into a file browser and type in the network location (\192.168.1.1FreeAgent Drive). Once I have done this I can can access the drive by clicking on the map I created in 'My Computer'.