Right so it was a format issue it had to be fatx, I was trying to avoid ftp'ing files all the time and going down the usb flashdrive route instead.... anyway one thing I do know now is how to do it.
I've been using 'Xplorer360 beta6 extreem2' to inject the files to the drive on the pc and then copying them via usb to the xbox.
I did do a search on the forum before asking and extensive googling yesterday without luck so hopefully anyone else who wanted to know the answer will see it here