Where did you buy it from?
Well known auction sites are notorious for selling fakes and sticks that are supposed to be a larger size than they are.
The 4k box is susceptible to the fakes and whilst it seems they are formatted fail in the box.
If you bought from a respectable retailer try and return it as faulty.
Whilst, in theory, the box can use a 1tb stick, a 256gb is usually recommended.
Please remember to mark Solved Posts with Best Answer. Doing so helps other customers and saves TalkTalk's Support Team time by only looking at unsolved topics. Thanks, Steve (a fellow customer).
