Okay,
The "plus" and "minus" DVDRs are two competing formats, released by different groups of corporations. They both do the same thing, but are incompatible. DVD+Rs can only be burned in a DVD+R burner, and DVD-Rs can only be burned in a DVD-R burner. Most burners you buy now are DVD±R, which can burn both types of discs.
"Dual layer" discs are more advanced than their older, single layer counterparts. Single layer discs can hold about 4.3GB of data, and dual layer discs can hold over 8GB. The practical result of which is that most newer commercial "pressed" DVDS are dual layer (also known as DVD9), and most (affordable) DVDRs are DVD5. If you watch very carefully on some poorly planned commercial DVD releases, you might notice a slight "freeze" in the film when the player switches from one layer to another. Only recently have dual layer burners become reasonably priced, but dual layer blanks are still prohibitively expensive for most uses.
I hope this helps,
~psi42
By the way, in the future please choose a thread title that is more descriptive. That way, when other people are looking for the same information you are, they will be more likely to find this thread in their searches. :)
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