You cannot guess. Use (Windows) or USBDev Tool to read the USB VID/PID and the NAND ID (e.g., 2C,C4,08,32,A6,00 – Micron).
If the real capacity is far lower than advertised… you have a fake drive. sm3280aa memory bar full
Without a direct reference to what "sm3280aa" is, it's challenging to provide precise steps. If "sm3280aa" refers to a: You cannot guess