Join Date:Joined: Jul 2013
This was pretty much obvious. 4xHD supports 64GB SDXCs, which were the largest available cards at the time. There's no software or hardware additions needed for a device to support a larger capacity once it supports any SDXC card. But thanks for the tip.
More pressing problem remains: 4X needs to get a universal driver for exFAT (not just thru Demetris' Optimus Play! kernel).