p.s. The Coolmax gadget does come with an AC power supply, along with two USB plugs so you can draw double the normal USB power when you're not using AC.
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If you're a real geek, you'll want one of these instead:
http://www.centralcomputer.com/itemdetail.asp?item=DRITOPCD350R
http://www.coolmaxusa.com/productDetails.asp?item=CD-350-COMBO&details=features&subcategory=converter&category=converter
It takes any size of SATA or IDE/ATA disk - 1.8", 2.5", 3.5", 5.25". Very handy!
(I have no connection with Central Computer or Coolmax other than being a customer.)
p.s. The Coolmax gadget does come with an AC power supply, along with two USB plugs so you can draw double the normal USB power when you're not using AC.