Memory Card 128GB 256GB SDXC/SDHC Mini sd card class 10 TF Flash drive

About capacity

128GBapproximately 115GB119GB

256GBapproximately 230GB238GB

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

Your PC says 1GB 1073741824 Billion bytes where Market Defines 1 GB 100 Billion bytesThe pursuit of the perfect person is not recommended to buy

Regarding the speed

the speed in our detailed picture is the highest speed of the memory card
and please use a USB30 card reader to plug in the 30USB interface of
the computer to test otherwise the speed will be lower

Package

1 X Micro sd card with free adapter Retail package