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

We always sell life-size flash drives, do not deceive buyers, maintain high quality, for global buyers.

To avoid data loss or mechanical damage, do not power down your computer or unplug flash disk during transfer.

Please do not remove your USB flash drive when it is being used otherwise your data may loss.

After using USB flash drive, it is better to remove it as soon as possible. That will helps to extend its storage lifetime.

Please do not format your USB flash drive frequently, otherwise the USB will be damaged easily.