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Few years ago people would use compact disk. Technology world is changing very rapidly for this compact disk lost from market and blu ray DVD occupied this place. Blu ray disk is easy to use then compact disk. Blu ray disk is stronger then compact disk. Size of blu ray DVD is also larger then CD. Blu ray DVD can’t play in CD player. For playing blu ray DVD must need blu ray dvd players. Blu ray is easy to write and more safe form other disk. Now this disk is popular in computer market and computer users use blu ray disk.