Fake USB flash drive, the chip capacity was changed from a lower capacity to a higher capacity by software. Like one chip is 256MB, it can be changed to 2G or higher.
When you insert a fake USB flash drive to the computer, it showed that 2G; You can copy a file about 1.5-1.8G to it, only the 256MB file can use. The other files are broken.
That is why some USB flash driver price is very cheap, lower than our normal chip price.