Tv box M8S sleep

Hi all
I have Chinese M8S TV box. Works fairly well. I've attached external drive as well. The thing is that when I shut it down it simply goes to sleep. So the external HDD stays on. Strange enough sometimes the led on the hdd starts blinking, but mostly it stays on.
So is there a away to configure the standby mode so that it turns the usb power off ?

Thanks much