. 16GB=approximately 14.4GB-14.8GB

· 32GB=approximately 28.5GB-30GB

· 64GB=approximately 58.5GB-60GB

· 128GB=approximately 115GB-120GB

Vendors are using Flash memory decimal arithmetic: 1 MB = 1000KB, 1G = 1000 MB

Calculated, operating system with binary arithmetic: 1 MB = 1024KB, 1 GB = 1024 MB;

So there are some differences between display capacity and nominal capacity of flash memory products