https://blog.faceutil.com/2017/05/12/%ec%b4%88%eb%b3%b4%eb%a5%bc-%ec%9c%84%ed%95%9c-%ea%b0%80%ec%9e%a5-%eb%b9%a0%eb%a5%b8-%ec%9c%88%eb%8f%84%ec%9a%b0-%ec%84%a4%ec%b9%98-usb-%ec%a0%9c%ec%9e%91%eb%b2%95-%e3%83%8d/