https://blog.faceutil.com/2017/04/24/%ec%a0%95%eb%a7%90-%ea%b0%84%eb%8b%a8%ed%95%9c-%ec%9c%88%eb%8f%84%ec%9a%b010-usb-%eb%b6%80%ed%8c%85-%eb%94%94%ec%8a%a4%ed%81%ac-%eb%a7%8c%eb%93%a4%ea%b8%b0-%ce%b2/