Best answer as chosen by user Topvid: Odd problem. Why not format the drive to what you need?
That is more likely to be NTFS and is not carved in stone. However if the GoFlex wireless function needs NTFS I can see why and decline to dive into file system minutia at this point.
What's also odd is that you write "do not need to travel with a computer" but an iPad is a computer and if we look at the other devices, there are computers in those things too! Maybe you meant you are trying to reduce weight.
How about a little jail break? Read and watch -> http://www.pocketables.com/2013/02/how-to-use-an-external-hard-drive-on-an-ipad-video.html
How about no jail bread? Read http://osx411.com/index.php?/topic/74-how-to-use-a-usb-flash-drive-with-the-ipad-using-the-camera-connection-kit/