Can't use usb stick with exported tracks on reckordbox dj performence mode

No, this is not possible.  Rekordbox only has the ability to read one database at a time.  

Have the songs been analyzed in your Rekordbox, so they appear in the collection in Performance mode?

Hi!

No they only appear in export mode and everything works's fine there. there is just no device section in performence mode like in export mode so my usb stick don't appear there.

Sorry to be a little bit rude but that's nonsens. Because it can read the drive database on export mode so why not in performence mode? It only need to READ the database from the stick like cdj's and it doesn't even need to import the data because I know some dj don't want that because they can steal you're drive and import it but why can it not be that there is a import lock but that it ONLY can PLAYBACK a reckordbox drive in performence mode just like in export mode where it work perfectly?

I assure you it's not nonsense.  Rekordbox does not have the ability to read multiple databases.  Each rekordbox device (USB drive or computer) has it's own unique database.  If you are running rekordbox on your computer, the software is reading your computer's database.  If your friend plugs his USB drive into your computer, rekordbox will not be able to recognize the second database and therefore will not be able to play tracks from that device.  

Some users have expressed their desire for rekordbox to read multiple databases and these requests have already been passed on to the product team.

That's maybe now in performence mode but what I mean is that it already "can read multiple databases" in export mode so it can be possible in performence mode but if you forwarded it I am happy.

Here we go. I made a video about it. You can watch it here: https://drive.google.com/open?id=0B0Kc_erpRrfKcjFnTjJzZnM5ZGs