USB physical ports

Arthur Chance freebsd at
Fri Sep 11 15:45:31 UTC 2015

On 11/09/2015 13:29, Polytropon wrote:
> On Thu, 10 Sep 2015 11:43:03 -0400, Ernie Luzar wrote:
>> I have 6 physical ports on my PC box. The boot time messages seem to say
>> that one of those ports is 480Mbps High Speed USB v2.0.
>> How do I determine which physical USB port is the 480Mbps High Speed port?
> Usually there are two ways:
> First, there is the visual inspection of the plastic bar inside
> the ports. They are color coded black, white, or blue, which
> refers to USB 1, 2, or 3 respectively.

Black and white can be either USB 1 or USB 2 according to Wikipedia and 
my experience. I've got both black and white USB 2.0 ports on my various 
bits of kit and apparently some Lenovo laptops use grey for USB 2.

Usually USB 3.0 ports are blue, unless they're yellow, red or orange. 
That can variously mean always on and/or high power/fast charge 
depending on manufacturer. From what I can glean, blue for USB 3 is a 
marketing thing, not a specification.

Standards, don't you just love them.

Those who do not learn from computing history are doomed to

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