What's the meaning of DVD R and DVD RW

DVD recordable and DVD rewritable are optical disc recording technologies. "R" format DVDs can be written once and read arbitrarily many times. "RW" format DVDs can be erased and rewritten multiple times. Both DVD R and DVD RW come in +/- formats. The essential difference between DVD +/-R and DVD +/-RW remains the same regardless of the + or -....

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