What is a dual layer dvd burner and how does it work

What is a dual layer dvd burner

Before explain the concept to you, let's talking about dual layer media first. Dual layer media, also known as DVD-R DL, means that much like commercially pressed DVD-ROWs, these recordable discs have two layers of dye, almost doubling the size of older DVD5 format to 8.5gb.This is a recordable DVD9 format. Only dvd burners with dual layer DL DVD R Media compatibility are able to burn the Dual layer media. This is what dual layer dvd burner is. If your dvd burner does not have the capabilities, it is possible to be upgraded to burn daul layer media.

Dual layer DVD technology

Dual-layer recording (sometimes also known as double-layer recording) allows DVD-R and DVD+R discs to store significantly more data-up to 8.54 gigabytes per disc, compared with 4.7 gigabytes for single-layer discs. Along with this, DVD-DL's have slower write speeds as compared to ordinary DVD's and when played on a DVD player, a slight transition can be seen between the layers.

Dual layer DVD technology is not new. Commonly called "DVD9", Hollywood has been churning out major motion pictures on stamped dual layer dvd discs for years. How else could they include the full length movie plus all the bonus materials commonly found on today's DVDs? Because dual layer technology has always been part of the dvd specifications, dual layer DVD recording on the desktop is the natural progression of single layer 4.7GB recordable technology.

How does it works?

When a dual layer recordable disc is inserted into a dual layer-compliant recorder, the optics will focus the laser at one of the dual layers to try and detect an “Address In Pre-groove” (ADIP) signal. From the ADIP signal, the recorder can detect whether the disc is dual layer and which layer it’s focused on. Once the media type and the layer are detected, the laser will be able to move its range of focus down or up to access any one of the two recordable layers. The drive will then focus on the Lead-In area of the disc to determine whether the disc is completely blank, partially recorded in Multi-session format, or Finalized (completed).

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