There's a complication to be aware of: USB hard drives (The spinny ones) suck power. The Pi cannot put enough power out to drive one directly. That means you either need to do some soldering work to modify the Pi, or else use a seperate powered USB hub. Additionally, if you're using battery power, you need to make sure your power supply circuit is capable of handling the load - which can be up to two amps for a few seconds during the drive spin-up.
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