Can I Use Bus-Powered USB Drive

Hi.
I have a La Cie ("All Terrain") USB hard drive that I normally connect directly to my G5 Quad's USB ports. It draws its power off the bus.
However, I'd like to use it with my Airport Extreme as a network-shared drive. Does anyone know with certainty whether the AE can supply the necessary power to the USB drive, or will I have to get a separate Transformer/Adapter for this USB drive. Also, am I taking any chances on harming the AE if I give it a try?

I have a WD Passport 250GB USB powered drive that works fine. I use it to stream video to my iMac. I also have a WD MyBook 1TB w/ external power that works fine for storage but is too slow for streaming.

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