Apologies, but may I ask what 'Terminal' is in Linux? Pardon my ignorance on this matter. I may have a laptop with Linux that I can try.
I think you can't without using eather a OS X or a linux live-cd of your choice and typing "lsusb -v" into the Terminal, to see if there is something like that in the Device-Descriptor -> " bcdDevice 1.20"
I tried it on Windows but it seems like there isnt a possibilty to check it over the Device-Manager.
So you rather have a OS-X Machine or download a Linux-Live CD (Ubuntu,Fedora whatever) of your choise and boot it up, plug the Dragonfly in, and do as i told you above :)
Is it normal that under Win7, you have to choose the according sample-rate without the option do dynamically chance it, depending on the audio-file?
On Linux it uses automatically the Samplerate the according Audiofile has(dynamically), but on Win7 it seems like it is fixed depending on the Settings i choose for the Dragonfly under "Sounds".
I'am using Foobar2000 btw.