Just been to an open decks night and the CDJs didn't recognise my USB. Formatted in FAT32, synced via Rekordbox and sucessfully used a few weeks ago. I even re-formatted the drive
How to format USB drive for Rekordbox & CDJ – DeeJay Plaza
How To Format a USB Drive For CDJ Use - DJ Tips & Tricks - Works On Windows PCs and Macs (FAT32) - YouTube
Usb Drive Not Working With Cdj | External Hard Drive on Cdj | Pioneer Dj | Windows Pc and Mac - YouTube
CDJ-2000NXS
How to format USB drive for Rekordbox & CDJ – DeeJay Plaza
CDJ - Wikipedia
Rekordbox DJ: SD Card and Flash Drive Not Being Recognized : r/Rekordbox
How to format USB drive for Rekordbox & CDJ – DeeJay Plaza
Playable Music File Formats; About Usb Devices; About Mp3/Aac Files - Pioneer CDJ-350 Operating Instructions Manual [Page 8] | ManualsLib
CDJセットを使ってみよう! その1 USBメモリ編|ミライノオンガク
How To Format a USB Drive For CDJ Use - DJ Tips & Tricks - Works On Windows PCs and Macs (FAT32) - YouTube
Controller Clinic #36: DJing With Traktor, CDJs and USBs?