iomega Prestige Portable 500GB USB 2.0 External Hard Drive 34169 - Newegg.com
"Good power feed - only needed to use the main USB connector on the Y cable and not the secondary power dongle..."
"I have always made my own backup drives from separate cases and drives (all purchased happily from Newegg), but the reviews from many different sites had a lot of good things to say, and they were spot on..."
"Can't recommend this enough - hopefully the price will drop to <$100 soon..."
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Amazon.com: Iomega Prestige 320 GB USB 2.0 Portable External ...
The pocket-sized USB powered Iomega® Prestige™ Portable Hard Drive, Compact Edition requires no external power supply — just plug it in and go...