About capacity:

16GB=approximately 14GB-15GB

32GB=approximately 28GB-30GB

64GB=approximately 58GB-60GB

128GB=approximately 117GB-124GB

200GB=approximately 182GB-186GB

256GB=approximately 230GB-249GB

512GB=approximately 460GB-499GB

1TB=approximately 920GB-980GB

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