About capacity:
64GB = approximately 56GB-60GB
128GB = approximately 112GB-120GB
256GB = approximately 225GB-238GB
512GB = approximately 450GB-476GB
1TB = approximately 900GB-950GB
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 1GB = 1.00 Billion bytes.
Testing Method:
The official factory default speed value is the ideal maximum value, the actual speed test process and the use of the environment-related (such as the use of equipment, different configurations, different types of file storage speed is different, because the type of file, size, size Different and different), so we can not guarantee the actual speed value! The speed show on our link is test by professional instrument, you'd better use 3.0 interface, then you can get a nice speed.
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