Rekordbox device issues

Hello!

I've been loving rekordbox so far but there's to really annoying problems that I've had lately. The first one is that Rekordbox won't export all songs although I select all of my tracks and click export. I'm using OSX formatted FAT32 USB devices (8 gb). The other issue I have is that Rekordbox is "renaming" my external harddrive where I have all of my tracks and my PIONEER folder, so all of a sudden my tracks are "unanalyzed". Any help would be appreciated! :)