Connected drives and max. HHD size

Hello out there,

How many connected drives does WD LIVE support? Currently I’ve one external HDD connected to my WD Live, and is wondering wheather or not it’s possible to connect one more HDD on the second USB-port. Furthermore I’d like to know, if it’s possible to use a HDD-hub, and connect serveral additional HDD’s?

What is the maksimum HHD-size the WD Live supports? When I bought my first external HDD, I deliberately bought an 2 GB HDD, due to the HDD-limitation (Around 2 years ago). Have this limitation been improved? 

4 TB drives have been reported to work fine as have been some active USB hubs to attach several disks.