About capacity:
32GB=approximately 28GB-30GB
64GB=approximately 58GB-59GB
128GB=approximately 118GB-120GB
This is calculation difference between manufacturer and our PC, please Google Memory card capacity to get more information.
Understanding speed classes:
*The SD card association defines card speeds using two terms: Speed Class and UHS Speed Class.

*Speed class is the original rating used and the number defines the card speed; class 4 for 4MB/s, 6 for 6MB/s. 10 for 10MB/s etc.

*UHS (Ultra High Speed) uses minimum write speeds to differentiate the cards; UHS-I Speed Class 1 has a minimum write speed of 10MB/s while UHS-I Speed Class 3 has a minimum write speed of 30MB/s.

*Speed based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. 1MB=1,000,000 byte

*Please dont use cheap card reader to test Micro SD card, speed of Micro SD card will be affected by low quality card reader （With high-quality 3.0 card reader and PC-side 3.0 USB interface） .

*The most reliable software to verify memory card is H2testw.

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