About Capacity:
Hard disk/flash memory vendors are using decimal arithmetic: 1MB=1000KB, 1G=1000MB calculated, but the operating system is using binary arithmetic: 1MB=1024KB, 1GB=1024MB. So there are some differences between display capacity and nominal capacity of hard disk/flash memory products. However, this is allowed to exist. Please do not doubt his authenticity.
8G=about 7.5GB, 16GB=about 14GB, 32GB=about 29GB, 40GB=about 37GB, 64GB=about57GB,
60GB=about 55GB, 80GB=about 74GB, 120GB=about 111GB, 128GB=about 119GB, 160GB=about 149GB,
250GB=about 232GB, 256GB=about 238GB, 320GB=about 298GB, 480GB=about 447GB, 500GB=about465GB, 512GB=about 476GB, 640GB=about 595GB, 960GB=about 894GB, 1TB=about 930GB, 2TB=about1862GB, 3TB=about 2793GB, 4TB=about 3724GB, 6TB=about 5586GB