I purchased the Iomega eGo BlackBelt portable HD (http://www.amazon.com/Iomega-BlackBelt-FireWire-Portable-35115/dp/B0041EM9XM/ref =pd_sxp_f_pt) a few years ago and have backed up my MacBook Pro using time machine. The cable is a firewire 800 with theses connections (http://www.newegg.com/Product/Product.aspx?Item=12-200-730&Tpk=N82E16812200730). The rounded side goes into the MacBook Pro. I am trying to get it to connect to my new MacBook Air with Thunderbolt. The Apple Firewire to Thunderbolt addapter does not fit the one end of the cable. So I purchased the Belkin Firewire 9-9 Pin Cable (http://www.belkin.com/us/F3N418-APL...L;jsessionid=89030857685109325329E6412E872E81) to use instead of the one that came with the HD. However, there is no power going to the HD. I've tried the split USB also with no luck. It powers with the original cable on the Pro, but not the Belkin cable and Apple adapter on the Air. Any suggestions?