{HEAD ~ This power state change} is communicated by the controller to the device driver in response to {TAIL ~ the device removal signal} 
{ HEAD ~ This power state change } is communicated by the controller to the device driver in response to { TAIL ~ the device removal signal }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL