How to export playlists of 2nd USB to Rekordbox?

Here it comes!

Yesterday I accidently pushed my USB stick just the moment my new playlist were being synced with rekordbox. The USB stick doesn't work anymore with rekordbox. I got a new USB stick today. I copied and pasted all my playlists and tracks from USB1 to USB2.

How can I keep USB1 connected to rekordbox while adding USB2 to it? How can I sync all the same songs from USB2 with rekordbox?

Huh, any help will be appreciated!

Thanks!