For some sample pictures of what Ian is referring to, see this page.
http://www.usbman.com/Guides/checking_for_usb_2.htm
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There is also the program UVCView, for looking at plugged in USB
devices, but it isn't a user friendly application. If you want
a copy, click one of the archived links here, to download it.
Microsoft used to offer this for download, but has since removed
it from their site. I think this displays anything plugged in
directly to the computer, but if you have a chain of USB hubs,
it won't show what is on them.
http://web.archive.org/*/http://dow...f-a31d-436b-9281-92cdfeae4b45/UVCView.x86.exe
The output of that program, looks roughly like the following
picture. The item highlighted in dark blue, is running at
USB2 rates (because it is under the USB 2.0 section), so
whatever is on Port 3 is USB2. I think one of the fields
in the detailed section on the right, allows a person to
confirm that fact.
http://www.die.de/blog/content/binary/usbview.png
You don't have to use UVCView, but it is available if
you need it.
Paul