Since I have a 256GB microSD card from SmartBuy, the actual write speed is about 22MB/s and the reading speed is 76MB/s. I'm hoping the reliability is higher. The manufacturer on the website offers a 5-year warranty, but I've had no issues with two 256GB microSD cards from SmartBuy for more than a year, even though I don't load them up too much; I simply use them to store pictures, movies, and music.
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