Topic: Hacking or accessing Vivint External HD

Long story short, I purchased a Vivint Security package; cameras, sensors and an External HD. I no longer have the monitored Vivint service, but I want to use my External HD. Is there a way to get into it to reformat it? It only has Ethernet and USB3 ports on the device. Plugging the device directly into the computer it does not show up as a connected device. I can plug it directly into the router, but still can't get to it. I can't find it to be able to access it or reformat. Is it just a paperweight or can it be hacked?