I have ordered 2 packs of 64GB MB-MC64GA cards, labeled both on the box and on the back of the SD card itself are. Both the box and the card also show UHS-1 and U3 speed ratings. Tests confirm the stated read and write speeds (sequential): 100 MB/s read and 60 MB/s write. If you don't get these speeds, make sure the data path between the card and the computer is fully USB 3.1 compliant. . If there's a USB 2.0 hub or reader along the way (like the one on the front of my computer), the speed drops to 40MB/s or less. At Revain, you can use a USB 3. 1 reader for less than $10. Random read and write speeds drop significantly, but in my experience this happens with all but the best (and most expensive) SD cards. At $12 each this represents good value. Happy with the purchase.
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