I have 2TB WD Purple hard drive for my Arris PVR(3510-M) that I want to replace the internal 500GB drive. Tried to format with Shaw expander as suggested in threads, but drive not recognized. 1TB drive recognized with no problem. Discussion threads suggest that the 2TB drive should work in this PVR, so why is it not being recognized? Anybody else replaced drive with this size and can you help me please?