About Speed Note:
8GB/16GB/32GB-Class 10 SDHC
64GB/128GB-Class 10 SDXC
This is a calculation difference between manufacturers and computer systems, 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; 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 don’t use cheap card readers to test Micro SD cards, speed of the card will be affected by the low quality card reader.
*The most reliable software to verify memory card is H2testw.