About capacity:
· 64GB=approximately 58.5GB-60GB

· 128GB=approximately 110GB-120GB

· 256GB=approximately 230GB-240GB

· 512GB=approximately 4600GB-480GB

· 1T=approximately 920GB-950GB

· 2T=approximately 1.8TB-1.9TB
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
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Thank you and nice day!