Easy Yes Or No Question Regarding Hardrives

I searched the board before asking this and while some questions are similar they dont give a straight forward answer.

I have a WDTV  Live Hub on firmware 3.01.19

I just want to know if I buy a 4tb hardrive and hook it via usb to my hub will it work.

If not will a 3tb hardive work.

I currently have the internal hardrive filled to capacity and 1tb external filled. With both of these at capacity I would like to transfer them to a 4tb drive so I can free up the internal drive and have all my files on one drive.

Thanks to those who respond.

3tb, yes, definitely. I have one and it works fine. Not sure on the 4tb, though.

Thanks!