Thunderbolt to Firewire Adapter gets very hot in use (?)

I've had the thunderbolt to firewire adapter cable for a month, connecting either a 500 GB or 1 TB "G-Drive" bus-powered HD. I note the small box at the firewire end of the adapter cable becomes quite warm in use.
Is this to be expected?
It is worrisome from, at least, the perspective of economy of power consumption, on a MacBook Air, used frequently away from a power outlet.

You might want to post in the MacBook Air forum, then. This is the Apple Thunderbolt Dislpaly forum...
Clinton

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