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产品都是高速足量芯片，具体细节如下：

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Capacity flash memory products are usually shipped in accordance with 1MB = 1000KB, 1G = 1000MB computing, but the operating system using binary arithmetic 1MB = 1024KB, 1GB = 1024MB, so there are some differences between the display capacity and standard capacity memory products.

16GB = approximately 14GB-15GB

32GB = approximately 28GB-30GB

64GB = approximately 58GB-60GB

128GB = approximately 110GB-120GB

256GB = approximately 230GB-240GB

512GB = approximately 455GB-465GB

This is calculation difference between manufacturer and your PC, please Google 'USB Flash Drive capacity' to get more information.