later I bought the 128GB version of this card hoping it would work with my Panasonic 991 4k camcorder. I looked at a few cards that advertised extreme speeds, but if you look closely they didn't have a sustained write speed that could handle the demands of 4k recording. I'm happy to report that this card works really well with 4k videos. It's Class 10 and U3, which means it meets the minimum requirements for most consumer 4k recorders. The price was very reasonable too, actually less than the 64GB versions of other similarly fast cards
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