What Is Difference Between DVD-R,DVD+R,DVD-RW,DVD+RW |Hindi/urdu| |mini scientists|

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Hello friends,maine us video main btaya hai ke DVD-R,DVD+R,DVD-RW,DVD+RW main kya difference aur DVD-R ke bad hume DVD-RW aur DVD+RW ki q need parhy aur kya humhe abhi bh DVDs use krni chaiye?
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