This is probably an oddball thing to post here, but here goes:
I have a 1TB Corsair Voyager Air Wireless/USB/Ethernet hard drive/NAS that I was going to install in the glove box in the Crossfire to store music/video/et cetera but I decided Bluetooth connectivity to my smart phone was good enough.
You can connect to it via wi-fi, Ethernet, or usb. It comes with a 12V dc adapter and a wall adapter, and there's an iOS and Android app. It's quite small since it's a 2.5" hard drive. It has a built in battery as well, good for 5-7 hours depending on who you ask.
Never opened, never used. $120 OBO. Generally sells for about $180.
Amazon link:
Brian