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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).
The basic types of DVD (12 cm diameter, single-sided or homogeneous double-sided) are referred to by a rough approximation of their capacity in gigabytes. In draft versions of the specification, DVD-5 indeed held five gigabytes, but some parameters were changed later on as explained above, so the capacity decreased.