Answer：Comprehensive answer to question 1. Storage industry standard: The actual capacity of the USB flash drive is not less than 90% of the nominal capacity is a qualified product. The actual capacity range of some common capacity USB flash drives is listed below. 1GB(900M-960M) 2GB(1860M-1960M) 4GB(3680M-3860M) 8GB(7680M-7800M) 16GB (14.4GB or more) 32GB (28.8GB or more) 64GB (57.6GB or more) 128GB (115.2GB or more) The actual capacity is in brackets.