About REAL Capacity
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.
Product Type :USB 3.0 Flash Drive
Application: PC, Notebook
Capacity :32GB/64GB/128GB (1GB=1Billion byte) * Actual usable capacity may be less (due to formatting, operating system, applications or otherwise)
Interface: USB 3.0
Connector :Standard A
Dimension (WxHxD) :40 X 12.2 X 10.92mm
Weight: Approx. 8.9g