mobile

I'm running the latest pre-rooted firmware. I understand the USB storage issues (I think :) ). When I insert a USB stick formatted as ex-fat which contains a TV show which is properly named, etc. the AFTV gives me the option to reformat the stick as FAT. I cancel. The AFTV then lists no external storage. Stickmount recognizes and mounts the device. Kodi also recognizes the device but does not see the content whether I specify local, TVDB or none. When I remove the USB stick and try to mount it on my Mac the device is now unrecognized. When I open Disk Utility the content has been erased so clearly the AFTV has does something to the stick.
Any ideas?