IEI Integration NANO-9453 v1.10 - Manual (Page 167)

NANO-9453 EPIC Motherboard
Page 147
Use the USB2.0 Controller Mode option to set the speed of the USB2.0 controller.
FullSpeed The controller is capable of operating at 12Mb/s
HiSpeed D EFAULT The controller is capable of operating at 480Mb/s
BIOS EHCI Handoff [Enabled]
Use the BIOS EHCI Handoff option for systems running OSes that do not have EHCI
hand-off support. The EHCI ownership change is managed by the EHCI driver.
Disabled Systems with OSes that do not support EHCI can
use the EHCI handoff functionality.
Enabled D EFAULT Systems with OSes that do not support EHCI cannot
use the EHCI handoff functionality.
6.3.9.1 USB Mass Storage Device Configuration
Use the USB Mass Storage Device Configuration menu (BIOS Menu 14) to configure USB
mass storage class devices.