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#11
The standard USB 2 port is limited to 500ma per port. If the external drive requires more than that it will often come with power pack, a second USB power cable, or the main cable will have two USB plugs on it. One power and DATA and one power only. My laptop drive enclosure came with the two cables. If I don't plug the power only cable in before the DATA and power cable the drive doesn't get detected properly and or acts erratic.