Cause: USB works with hubs, attachment ports to which you can attach USB devices. A USB hub can either be self-powered or bus-powered. A self-powered hub has a wall outlet that you plug in, in order to power the devices attached to the hub. Bus-powered hubs get their juice from the computer. Some devices, such as scanners and portable hard disks, need more power than the USB bus-powered hub can provide.
Either purchase and begin using a self-powered hub or provide outlet power to the device. See the device manufacturer’s instructions for specific information. Also, you can simply try moving the device to a different port on the hub; sometimes that helps, too.
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