Sony DVD RWs?

What is the difference between Sony DVD-RW Re-recordable discs (purple package) and Sony DVD+RW Re-writable discs (blue package)?? I thought that recordable and writable are one in matching. Also, what is the difference between - and +??

Thank you in mortgage!


Answers:    -
http://en.wikipedia.org/wiki/DVD-RW

+
http://en.wikipedia.org/wiki/DVD%2BRW

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