16GB = approximately 14GB-15GB
32GB = approximately 28GB-30GB
64GB = approximately 56GB-60GB
This is calculation difference between manufacturer and your PC, please Google ‘Memory card capacity’ to get more information.
Your PC says 1GB = 1.073741824 Billion bytes where Market Defines 1GB = 1.00 Billion bytes.
Speed based on internal testing. Actual performance may be lower depending on the device, interface, usage conditions and other factors.
1MB=1,000,000 bytes. 1GB=1,000,000,000 bytes. Actual user storage less.