Generally is 2 layer in a Dual layer DVD.
dual layer means there are layers of pits and lands on the dvd
A standard DVD typically consists of two layers for storing data, one on each side of the disc. Dual-layer DVDs can have up to four layers, two on each side, to increase storage capacity.
A Double Layer or "Dual Layer" drive is able to write two layers of data onto a DVD, effectively doubling the storage space. Be sure to purchase DVD-R media that is approved for dual layer use.
The most common DVD type is DVD-5 (1 side, 1 layer) having 4.7GB of storage. Double-sided DVDs are rarely used. DVD-5 4.70GB Single sided, Single layer DVD-9 8.54GB Single sided, Dual layer DVD-10 9.40GB Double sided, Single layers DVD-14 13.24GB Double sided, One side single layer, one side dual layer DVD-18 17.08GB Double sided, Dual layer
DVD-SuperMulti Dual Layer
Single Layer, Dual Layer, Quad Layer i think
A dual layer DVD has more space compared to a single layer DVD. Instead of holding 4.7GB, a dual layer DVD can hold over 8GB. Aside from more space, they also tend to read faster than single layer ones.
Answer: How dual layer CD drives workCheck out this website: http://computer.howstuffworks.com/cd-burner.htm The main difference between a single layer and dual layer CD is that a dual layer CD or DVD has two layers of film on which data can be written to. One layer (the bottom one) is semi-silvered so that depending on the intensity of the laser, data can be read on each surface. The laser adjusts its intensity accordingly to which layer it want to read/write from.
The dual layer burner supports DVD-DL discs, dual layer DVDs with just under 9GB of storage space.
DVD+R DL (also called DVD+R9) is a Dual Layer writeable DVD+R.DVD-R DL (also called DVD-R9) is a Dual Layer writeable DVD-R. The dual layered discs can hold 7.95GBThe dual layered discs (DVD+R9 and DVD-R9) can hold 7.95GB and double sided dual layer (called dvd-18) can hold 15.9GB.
There are such things as Dual Layer DVD's, DVD-R9. They have two data layers and a capacity of around 8.5GB, and require a special burner to write to them, though can usually be read by most normal readers.
Very much depends on the capabilities of the drive. Most drives will tell you in the manual. Or you can look up the drive on the manufacturer's website and check there. Some drives will have a DVD+/-DL on the front, if it says "DL" it can handle dual layers.