Is there a portable "power source" where I can plug in my desktop external hard drive?
I recently bought a 1TB desktop external hard drive, I know it's not supposed to be travel friendsly since it has to be plugged in first to an AC outlet to have it working. But my problem is, there are times when I have to bring it out with me in some places where I can't have it plugged in to a power source (i.e. in a restaurant perhaps). So my question is, is there a portable "power source" or a battery or a "charger" where I can plug in my desktop external hard drive? The concept is kind of similar to a portable cellphone charger. Thanks in advance for helping! 
Its unlikely that you will be able to source something like this as a 1TB hard drive is going to chew through any battery type power supply quickly. You can use power from your USB sockets on your laptop but it will take a lot of power from the laptop battery and reduce use time considerably.
A 'wind up' power supply may be the way to go, but I don't think they are commercially available yet.
Check out your local Radio Shack / Maplins type store, you may find something designed for a different product but with the correct voltage output to suit your needs.
Universal Travel Power Adapter Plug for UK Ireland
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