Official comment
Hi Lorenz,
Unfortunately not all USB drives are compatible with all players. We are aware that some of the older units (like the CDJ-2000 / 2000NXS, XDJ-1000, XDJ-700, XDJ-RX / RR) are more likely to have issues with USB3.1 devices. While USB3.1 is supposed to be backwards-compatible, it's typically the memory controller on the device which has issues with the host controller. Sadly, you may simply have to use another drive.
