5TB drives have been reporting “working” with the late model wdtv’s (2011/2014)
(personally, i’ve only tried a 4TB … and that’s works fine)
thread here
WDTV Gen 1 can only handle a Maximum of 2TB … and it’s probably too late to tell you this now, but, attempting to connect a 5TB to Gen 1 or 2 can result in Data Corruption