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8GB = approximately 7.4GB-7.6GB

16GB = approximately 14GB-15GB

32GB = approximately 28GB-30GB

64GB = approximately 58GB-60GB

128GB = approximately 119GB-120GB

This is calculation difference between manufacturer and your PC, please Google 'Memory card capacity' to get more information.

For your reference

Your PC says 1GB = 1.073741824 Billion bytes where Market Defines 1 GB = 1.00 Billion bytes.

Speed of Memory card and USB

If you feel the speed are very slow, please try to use below software to test it. Please prepare USB 3.0 plug, USB 3.0 card reader or USB 3.0 cable before you run the test. Otherwise, the test result will be slow as normal.

Step 1 : Download the h2testw_1.4 software in here
https://drive.google.com/folderview?id=0B-hT-W6c1ceIU3ZLMlBRV25FZlk&usp=sharing

Step 2 :        Insert your memory card / USB and follow the step in the software, it takes some time to run the test. Please make sure it will not lose connection during the test.