How does a dual layer DVD burner work?

Dual layer recording





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 was developed for the DVD Forum by Pioneer Corporation, DVD+R DL was developed for the DVD+RW Alliance by Philips and Mitsubishi Kagaku Media (MKM). [6]





A Dual Layer disc differs from its usual DVD counterpart by employing a second physical layer within the disc itself. The drive with Dual Layer capability accesses the second layer by shining the laser through the first semi-transparent layer. The layer change mechanism in some DVD players can show a noticeable pause, as long as two seconds by some accounts. This caused more than a few viewers to worry that their dual layer discs were damaged or defective, with the end result that studios began listing a standard message explaining the dual layer pausing effect on all dual layer disc packaging.





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 remain significantly more expensive.How does a dual layer DVD burner work?
you have a buy dual layer dvds (they can be expensive). the reason for them is that you can store twice as much data as your standard dvd. so you get 8gb per disc instead of 4.How does a dual layer DVD burner work?
There are two layers on the disk and they are both affected by a different intensity of lazer beam. So you need a special burner.