https://blog.faceutil.com/2017/04/12/%ed%9c%b4%ec%a7%80%ed%86%b5%ec%97%90%ec%84%9c-%ec%82%ad%ec%a0%9c%ed%95%9c-%ed%8c%8c%ec%9d%bc-%eb%b3%b5%ea%b5%ac-usb%eb%a9%94%eb%aa%a8%eb%a6%ac-%eb%b3%b5%ea%b5%ac%ed%94%84%eb%a1%9c%ea%b7%b8%eb%9e%a8/