HT5219 Do I have Thunderbolt On my Mac?  Does it work?

I'm trying to install a WD MyBook Thunderbolt 4T to my Mac Snow Leopard OS X 10.6.8.  It will be used to store photos.  I am unable to get the WD MyBook to show in my Finder.  How can I confirm that I have Thunderbolt firmware and that it works properly?  I am using an Apple Thunderbolt cable to connect the device.  When I connect it, the WD MyBook does not even show the light indicating connectivity, but it is running.  Thanks for any suggestions you make!

Hmm, in order to try to manually mount it in Disk Utility, it would have to at least show up. I just did a search here and found quite a few hits, here are the search results:
https://discussions.apple.com/community/desktop_computers/search.jspa?peopleEnab led=true&userID=&containerType=&container=&spotlight=false&q=external%20drive%20 does%20not%20show%20in%20disk%20utility
If that doesn't work ( it is a bit long, isn't it), here is one of the search results (and search for "external drive does not show in disk utility"):
https://discussions.apple.com/message/19474505#19474505

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