Bought this card a week ago when I got my new Nikon D850. Took less than 50 test shots, deleted photos and reformatted the card once or twice. The card now reports an error. Unable to reformat to fix the error. The card is a total loss. Now I have to find it in the store for tomorrow's photo shoot. I hope to find another brand other than Sony. [UPDATE May 12, 2019] I went to my local camera shop and spoke to one of the salespeople. He recommended Delkin Devices' XQD cards, not Sony's non-Sony XQD cards. They're a bit more expensive, but I haven't had any issues with the card before, during, or after the client's photo session.
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