8GB U1 Class10 speed == Above 10 MB/s = SDHC16GB U1 Class10 speed == Max Read speed to 48 MB/s = SDHC32GB U1 Class10 speed == Max Rread speed to 60 MB/s = SDHC64GB U3 Class10 speed == Max Rread speed to 80 MB/s = SDXC128GB U3 Class10 speed == Max Rread speed to 80 MB/s = SDXCThe above test data are based on the (ATTO Disk Benchmark) test results.The actual test speed should be based on the level of the card reader or computer excuse.Ask the buyer to test in the highest possible way.Use USB 3.0 card reader.And the USB3.0 port for the computer.Warm Tips:Please don't use cheap card reader to test Micro SD card, speed of Micro SD card will be reduced by low quality card readerThe most reliable software to verify memory card is H2testwMicro SD card speed is greatly affected by card reader, adapter, USB port etc. Low quality device will 100% slow down card speed.Up to 40MB/s read speed; write speed lower. Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes.
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