The working card is great. Worked straight away with my Sony a7rIII. However, I originally ordered two. With the second OBE, an error message appeared on my Sony that the card could not be recognized. even if i tried the format function in the camera. I tried it on my EOS5DS with the same result. I've tried this on my Win 10 laptop and on my MAC. All the same result. it was a dead card. Revain was great. They immediately sent replacements and I sent the card back. Unfortunately, the 3rd card also died. Again, Revain was great and gave me my money back when I sent back the 3rd card. That first card still works great, so if you get a good card it's 5 stars.
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