rekord box doesn't recognize my external drive

Hi everyone,

I just got a pioneer controller and i already managed to export playlists to a usb stick of 32gb. But now i want to move all my playlists to my external drive of 500gb but the problem is that in SyncManager (or in left bottom window of rekordbox) my external drive is not recognized as a device by rekordbox thus it's not possible to export my playlists on it. 

I have already looked on internet and i have partitioned my external drive in a smaller FAT32 format but it still doesn't work.