12VDC, 1.5A external power adapter Well that is what this page says, it's not your 120GB drive but unsure if it's no the same model maybe. However all external HDD that need a power supply should be needing 12 volts, as they are just internal drives mounted in a shell and some simple circuitry to power and connect it.
My Simpletech - Simpledrive takes a DC adapter 5v 1a - a bit smaller than rec above. AVAILABLE AT AMAZON
I got the information I posted on voltage above directly from the manufacturer of this product.
160 GB 2.5-inch USB 2.0 portable hard drive for fast, reliable desktop or laptop storage
5400 RPM spin rate; 8 Mb buffer cache; transfer speeds up to 480 Mb/s
Powers via USB connection
Designed by Pininfarina, the designer of Ferrari sports cars
Well when I looked it up at Simpletech's site it kept saying 12 volt power supply, when the specs say it's only powered by USB, with no mention of having a DC power port. I apologize for my previous information. Yet apparently fostersgirl has one and she has a DC adapter for hers.
1-year limited warranty
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There are two options of adapter (see below) both will work 
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