This is calculation difference between manufacturer and our PC, please Google ‘Memory card capacity’ to get more information
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Please use quaity card reader to verify all memory card by H2testw on PC
Please don’t use cheap card reader to test Micro SD card, speed of Micro SD card will be reduced by low quality card reader
The most reliable software to verify memory card is H2testw
**Micro SD card speed is greatly affected by card reader, adapter, USB port etc. Low quality device will 100% slow down card speed.
**Up to 90MB/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.