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6. (For laptop users only) To prevent Windows from turning off the USB root hub
when the computer is running ‘On battery’ power, select Disabled in the On
battery list.
7. To prevent Windows from turning off the USB root hub when the computer is
‘Plugged in’ to a power outlet, select Disabled in the Plugged in list and then
click OK.
For more information, please refer to the Microsoft knowledge
base: http://support.microsoft.com/kb/930312