1.what is the write speed?

Micro SD Card and SD Card write speed u0026nbsp;6.01M/S---12.01M/S；

USB 2.0 Flash Drive write speed u0026nbsp;2.8M/S---9.9M/S ; u0026nbsp;

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2.Why the USB flash drive real capacity is not correct capacity?

u0026nbsp;4GB=approximately 3.2GB-3.8GB

8GB=approximately 6.9GB-7.3GB

16GB=approximately 14GB-15GB

32GB=approximately 28GB-31GB

64GB=approximately 58GB-63GB

128GB=approximately 115GB-126GB

Thisu0026nbsp;isu0026nbsp;calculationu0026nbsp;differenceu0026nbsp;betweenu0026nbsp;manufactureru0026nbsp;andu0026nbsp;ouru0026nbsp;PC,u0026nbsp;pleaseu0026nbsp;Googleu0026nbsp;'Memoryu0026nbsp;cardu0026nbsp;capacity'u0026nbsp;tou0026nbsp;getu0026nbsp;moreu0026nbsp;information

3.about format

4GB/8GB/16GB/32GBu0026nbsp;= FAT32;