I have, personally, no direct experience with this product. I bought it for a person who brought this device to Italy.
I am sorry I cannot give you a better answer.
Best regards.
Ray Q.

Contents Connections Playback Settings Tips Appendix Connect the USB memory device to the USB port.
For operating instructions, see "Playing back USB memory devices" (v p. 48). USB-
Storage device
0 Denon cannot guarantee that all USB memory devices can be used or supplied with power. If you are using a USB mobile hard disk drive that has a power adapter, use it.
NOTE
0 USB memory device cannot be used via a USB hub.
0 It is not possible to use this unit when it is connected to the USB port of a computer by USB cable.
0 Do not use an extension cable when connecting a USB memory device. This could cause radio interference with other devices.
devices.