Okay, so I did something wrong, or "not what I intended".
My intention was to partition my 320gig external hard drive into 2 volumes equally and use one volume for apple time machine, and the other for data transfers between mac and windows computers.
However, what I did was plug the 320gig seagate free-agent harddrive into the mac, go to time-machine, and followed instructions, assuming it would take me to a partition settings area.
It didn't-- It went forward and formatted the entire hard drive and used the entire thing for apple time machine. Now when I plug the hard drive into a windows computer, it can detect and install the hdd, but it won't appear in my computer as a volume that I can transfer my files too.
Please advise me on what to do-- I'm a fresh mac convert.