External hard drive that gets its power supply from the PC

External hard drive that gets its power supply from the PC I need an external drive to connect to my MacMini. I've been using an 80gb 2.5 drive in an enclosure and it's fine, but now I need a 1.5TB drive.
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Guest [Entry]

"Only 2.5 inch hard drives can be powered off the USB bus. The current largest is a 640gb (http://www.gearlog.com/2009/09/toshiba_intros_industrys_large.php#).

3.5 inch drives require more power and cannot be powered by the USB bus because of thier power requirements. These drives are available up to 2Tb."