1. About the actual capacity: due to the difference between the manufacturer and the equipment used, the actual capacity is less than the nominal capacity, generally about 90% of the nominal capacity
2. About reading and writing speed: the data in the product description are all from the official. It is recommended to use the 3.0 card reader and USB in order to show the proper speed. The actual speed is related to the personal use of the device. We do not guarantee the actual speed, only guarantee that it is genuine.