Great microsd, i got these for my raspberry pi and not sure about the microsd card adapter i bought to use in my linux computer using it to write images to it is why I've seen these speeds or the card (or a combination of both) but when I wrote a 32GB img file to this card I got a write speed of 90MB/s seen. then i thought i should take a screenshot of it but it started crashing but still fixed it at 83.4mb/s see photo. When it finished 7 minutes later, it had finished recording at around 72MB/s. pretty good! I used this MicroSD card adapter also bought from Amazon SmartQ C307 USB 3.0 Portable Card Reader for SD, SDHC, SDXC, MicroSD, MicroSDHC, MicroSDXC with advanced universal design
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