I tried reading as much of this as I could but I wasn't sure what would happen in my scenario. I own the following HDD:

http://www.hypershop.com/HyperDrive-COLORSPACE-s/23.htm

This drive has an internal battery to drive operation because of the screen and etc. There is a connector to take power from a battery or wall jack if you want extra juice to recharge while in use.

My question is I know the N900 doesn't supply power in its USB connection, so since this drive doesn't need power from the USB, can I get it to work with the N900?

I am a photographer that works on the road. With this I could send files from anywhere in the world that has cell coverage without the need for bringing a laptop. This would be HUGE. Any suggestions? Thanks.