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Siemens AG
Entry type: FAQ Entry ID: 109742381, Entry date: 07/07/2017
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Why are USB 3.0 devices recognized by Windows even though the USB port is disabled?

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  • Associated product(s)
USB 2.0 and USB 3.0 interfaces have to be disabled separately.

Description
Even though all the USB ports have been disabled using the option "Per-Port Control" (in the BIOS Setup menu "Advanced") Windows still recognizes and automatically installs USB 3.0 devices.

Cause
Separate controllers in the chipset are responsible for the USB 2.0 and USB 3.0 interfaces. For each controller there is an option in the BISO Setup for setting the operating mode:

  • USB 3.0 - Option "XHCI"
  • USB 2.0 - Option "Per-Port Control".

To completely disable USB you must configure both options together.

Solution
The BIOS Setup setting "XHCI" is set to "Auto" by default. Change the setting of this option to "Disabled". This disables the USB 3.0 support.

Change the "Per-Port Control" option to "Enabled". This presents a list of the available USB ports of the system. Disable any unneeded USB ports. Save the settings in the BIOS and restart your SIMATIC IPC.

Now Windows will no longer recognize any USB 3.0 devices.

Warning
If all the USB 2.0 and USB 3.0 USB interfaces are disabled, you can no longer operate the device via a USB device.

Note
A detailed description of the BIOS functions of your SIMATIC IPC is available in the Entry ID 92189178.


Security information
In order to protect technical infrastructures, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art IT security concept. Siemens’ products and solutions constitute one element of such a concept. For more information about cyber security, please visit
http://www.siemens.com/industrialsecurity.