16GB = approximately 14GB-15GB
32GB = approximately 28GB-30GB
64GB = approximately 58GB-60GB
128GB = approximately 119GB-120GB
256GB = approximately 224GB-240GB
This is calculation difference between manufacturer and your PC, please Google'Memory card capacity' to get more information.
Your PC says 1GB = 1.073741824 Billion bytes where Market Defines 1 GB = 1.00 Billion bytes. The pursuit of the perfect person is not recommended to buy.
(1). The speed show on our link is tested by Sandisk by our professional instrument, you'd better use 3.0 interface and 3.0 card reader, then you can get a nice speed.
(2). Speed is influenced by many different factors, interface, computer condition, test software, systems, use, etc.
(3). If you test a low speed by yourself, please do not worry, you can try another instrument to test (need 3.0 interface and 3.0 card reader). And if you always get the same low speed, you can return the goods, then we refund you all the money.
(4). We can 100% promise that our product is all 100% original, there is a security verification label on each package.
(5). Once you place your order, it means you had read and agree with my description.