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DVD Dual means that the drive can burn both media types (both + and - media). Some drives only burn 1 type. DVD Super Multi is a drive that will support DVD -, + and RAM media. Personally, I think compatibility is better for the - media since more players support this media type (out before + media and more standardized vs RAM media).
Sharful wants to copy some DVDs, but they contain more information than will fit on his blank discs. DVDs can be manufactured with either one or two data layers. Single-layer discs hold 4.7GB, and are also known as DVD-5s. Double-layer discs hold 8.5GB, and are thus called DVD-9s.