USB powered hard drive recommendation?

I am having trouble finding an external removable hard drive that can be powered through my USB.
I bought one a Western Digital 120g portable drive - it won't even show up or eject unless it's plugged in with a cord I swiped from another device.
After reading the posts, it seems this is a problem. Any recommendations for brands/sizes that don't require a power source?
Thank you very much,
Emily

I would be willing to use whatever one works - I am not as savvy on my machine as I once was so I appreciate ANY pointers.
I am trying to keep some photos/video on an external, portable, self-powered hard drive. I don't need to boot it up, just access it as additional storage.
I do have a firewire port. I didn't know if that would have difficulty powering a device the same way my USB port is limited in powering - so any tips for an external, portable hard drive that is powered through the laptop, either via USB or Firewire, would be appreciated.
Let me know if I'm asking the wrong question or need to go a different direction.
Thanks again!
Emily
PS Did they change the forum? I know I've posted lots and lots of dumb questions!

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