USB 3.0 HDD (extern) slow transferrate

Hi guys,

i am new to this forum and i really hope you can help me. Searching the web and this forum i did not found a solution for my issue.

I run OMV 3.0.94 (Erasmus) with linux 4.9.0-0.bpo.4-amd64 Kernel. I ve bought a new external USB HDD. When i want to make a backup, i do not have usb 3.0 speed. My transfer rates are only 5mb/s.
But why?

Is it necessary to install some drivers? Can you help me to find a solution?

I've already checked  lspci -nnk | grep "USB controller" -A2

with output:

00:14.0 USB controller [0c03]: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI [8086:8c31] (rev 05)
        Subsystem: ASRock Incorporation Device [1849:8c31]
        Kernel driver in use: xhci_hcd
--
00:1a.0 USB controller [0c03]: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 [8086:8c2d] (rev 05)
        Subsystem: ASRock Incorporation Device [1849:8c2d]
        Kernel driver in use: ehci-pci
--
00:1d.0 USB controller [0c03]: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 [8086:8c26] (rev 05)
        Subsystem: ASRock Incorporation Device [1849:8c26]
        Kernel driver in use: ehci-pci

But i it means nothing to me. I've read that some outputs say you have to load a module in nano /etc/modules^ but when i add xhci_hcd or ehci_pci nothing changes.

Thanks so far.
pauabaer