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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).
A dual layer DVD (Digital Versatile Disc) is similar to the original DVD created by EFMPlus in 1995 except it can store up to 8.5 gigabytes of data instead of just 4.7 gigabytes. Since a dual layer DVD has a different storage capacity you also need advanced hardware and software to burn dual layer DVD discs.