What is the advantage of a Dual Layer DVD writer?

In theory, you could copy a feature length movie (most of which are on 8.5 gb dual layer disks) onto one without having to compress it. But the blanks are still very expensive, and the whole DVD shebang is on the verge of obsolencence anyway, so don't bother with it if you haven't already got one, unless you have a specific reason for having one.What is the advantage of a Dual Layer DVD writer?
this copies on two sides of a disk,, so twice as much stuff, like music, photos etc,,,What is the advantage of a Dual Layer DVD writer?
Dual Layer recording allows DVD-R and DVD+R discs to store significantly more data, up to 8.5 Gigabytes per disc, compared with 4.7 Gigabytes for single-layer discs. DVD-R DL (dual layer) was developed for the DVD Forum by Pioneer Corporation, DVD+R DL (double layer) was developed for the DVD+RW Alliance by Sony.





DVD recordable discs supporting this technology are backward compatible with some existing DVD players and DVD-ROM drives. Many current DVD recorders support dual-layer technology, and the price point is comparable to that of single-layer drives, though the blank media remains significantly more expensive. Currently the technology has severe problems with compatibility in hardware DVD players.





When a DVD disc is dual layer, there is sometimes a noticeable pause in video play. This is seemingly most notable in the movie Black Hawk Down, when a soldier's arm is severed and another soldier picks it up. A lot of confusion arose because of this (with people thinking their discs were damaged).
all of the above answers are crap double layer means it burns faster with less burn errors
A dual layer DVD-Writer allows you to record twice the amount of data as a single layer writer. This can be very helpful when you are working with feature length video. Most commercial DVD discs are actually Dual Layer discs.
dual layer dvd increases the size of the dvd in gigabytes.. from 4.3?? to 8.2? something like that,, unless you need to burn big ammounts of data its not really worth the upgrade if thats what your thinking but if your out to buy new for sure go with the dual layer,, it will be needed eventually hmmm buy movies online download and burn.. Apple Imovies?? hmmmm
Basically you can write about 8.5GB of data as opposed to 4.7GB of data on a standard dvd. (This requires a dual layer disk as well as writer).