Lots of buttons and connectors
The Netgear WNDR4700 has quite a few buttons for a router. On the right side there is the usual WPS button, a button to disable the wireless module, and a button for creating a back-up. Below the buttons there is a USB 3.0 port and an SD card reader.
On the back there are four LAN ports, a WAN port, a second USB 3.0 port, the power switch, and a reset button. On the left side you'll find the connector that's the distinguishing feature of this router: the SATA port. The drivebay fits 3.5-inch disks, and Netgear includes an adapter for making the opening narrower in order to fit single-platter disks and 19 mm models.
While there is no upper limit to the size of the hard disks, the WNDR4700 can't format disks larger than 2 TB. It won't recognize the capacity above that. However, if you format the disks somewhere else where the full size is recognized, then the WNDR4700 has no problem seeing the full disk, even if it's larger than 2 TB.