This just may be a typo but FDISK is where you would have set the "Active" partition. It would have asked if you wanted Large Disk Support and allowed you to set it as one single partition. As dude said, FAT32.
Here is a complete explanation: http://support.microsoft.com/defaul...port/kb/articles/Q255/8/67.ASP&NoWebContent=1
Once you use FDISK then you can "format" the drive.