diffrent types of data storage media

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there are many types of storage media like flopy,cd,dvd,zip disk,blue ray.As the time progresses the need of data storage increases.at frist flopy was used as a storage media which can be carried place to place.but it's capacity is only 1.44 mb means we can only carry some documents or pics in it.then cd came in the market it consists of 700 mb storage space which is than flopy now we can carry many things on cd.then dvd came in the market it is alarge data storage media the capacity of a dvd is 4700 mb 6 time grater then a cd a dual layer dvd's capacity is 8500 mb which is 12 times grater than cd.the future storage media is blue ray the capacity of a single layer blue ray is 25 gb (25000 mb) & dual layer blue ray is 50 gb (50000 mb).a dvd or ablue ray can contain several hours of high quality video.