https://itmanual.net/%ec%a0%9c%eb%84%a4%ec%8b%9c%ec%8a%a4-g80-%ec%b9%b4%eb%93%9c%ed%82%a4-gv70-gv80-%eb%93%b1%eb%a1%9d-%ec%95%84%ec%9d%b4%ed%8f%b0/