https://purengom.com/2008/03/06/blu-ray-hd-dvd-%ed%8f%ac%eb%a7%b7-%ec%a0%84%ec%9f%81%ec%9d%b4-%eb%81%9d%eb%82%98%ea%b3%a0-%ec%9b%8c%ec%8b%b1%ed%84%b4-%ed%8f%ac%ec%8a%a4%ed%8a%b8-%ea%b8%b0%ec%9e%90%ec%9d%98-%ed%8f%ac%ec%8a%a4/