Avoid under powering Your USB Devices

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IF YOUR PC'S USB ports are filled tip with USB hubs that are packed with yet more USB devices, make sure that all of those gadgets are getting the power they need to run properly. A single USB root hub which typically supports two USB ports on your PC's motherboard, delivers a minimum of 500 milliamps of electricity to its attached devices. If the power demands of your systems connected USB devices exceed that number, the whole USB bus can shutdown.

Check your power needs in Windows by opening Device Manager. In XP click Start, right-click My Computer, and select Manage. In Vista click Start, right-click Computer, and select Manage, In the Computer Management window select Device Manager from the left pane. In the right pane, double-click each instance of USB Root Hub listed under Universal Serial Bus Controllers, and open the Power tab for each one (seethe screen shot above right). On that tab you'll see a listing of how much power each USB port or attached USB device uses. If you would like to identify a USB device on your system use NirSoft's USBDeview. This handy free utility provides names, serial numbers, USB ports and other useful data for keeping track of all your connected gadgets.

*.* Source of Information : April 2008 PC World

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