I recently bought an Airport Extreme 6th Gen and I would like to connect an external hdd to the usb port. Here's my question. My HDD is a WD Blue 2.5 320GB connected to a external hdd enclosure. This enclosure feature a usb cable with a double usb plug dongle. Is it okay if I only plug 1 usb cable in the airport extreme (only as 1 plug) or will it draw too much current? I don't want to damage my router.