1. Academically, 1024M=1G, so the standard should be 4096M=4G, and so does the computer system. However, equipment manufacturers generally use 1000M=1G as the standard. In fact, the capacity of the purchased products in the system is a little smaller than the capacity of the manufacturer's trademark. 2. It may also be that some software, such as encryption disk, is installed in the USB flash drive, which will take up some space, so it will be smaller than the actual size 3. The last possibility is to buy black products. Black manufacturers or profiteers have changed the internal information of the USB flash disk, which makes the USB flash disk capacity appear to increase significantly. In fact, it is not the true capacity of the USB flash disk. 4. First tier brand disk, like Kingston 4G USB disk, with a capacity of 3.7G;Yuzhan 4G USB flash drive, with a capacity of 3.72G;So generally, products around 3.7G are sufficient. Some products only have 3.2G in 4G, which is much smaller. Some black disks are expansion disks, and 512M ones are changed to 4G.
