Capacity flash memory products are usually shipped in accordance with 1MB = 1000KB, 1G = 1000MB computing, but the operatingsystem using binary arithmetic 1MB=1024KB, 1GB = 1024MB, so there are some differences between the display capacity and standard capacity memory products.This is calculation difference between manufacturer and our PC.

16GB=approximately 14GB-15GB      

This is calculation difference between manufacturer and our PC, please Google 'Memory card capacity' to get more information.