Bit settings and book type modifications are carried out in the Nero DiscSpeed – Bit Setting window.   
The Drive settings area shows the defined book type, as well as all the changes that can be made. The following information is displayed:

 

Disc type
Shows the disc type of the disc in the drive.
Book type
Shows the book type of the disc in the drive.
Disc type
Disc type refers to different optical storage media with different specifications. The best known are CD’s and DVD’s that can be written to once or multiple times, and which are manufactured with different storage capacities.
The following setting options are available:
Menu
New setting
Shows which new settings can be selected for the book type.
Media types not supported by the chosen optical drive are grayed out.
Button
Set
Accepts the changes made.
Check box
Set as default
If this check box is enabled, the chosen changes will be retained as the default settings for the optical drive even after the computer is restarted.
This check box will be grayed out if the optical drive does not support this feature.
The Disc settings area shows the disc type currently selected and the selected book type.
Book Type
The book type defines the specification (e.g. DVD-, DVD+, DVD-ROM) of a DVD. In order to ensure correct playback, the DVD specifications are defined in books so that all media can be read correctly. The specifications are defined in the so-called Rainbow Books, which are distinguished by means of their color (e.g. Yellow Book).
Disc type
Disc type refers to different optical storage media with different specifications. The best known are CD’s and DVD’s that can be written to once or multiple times, and which are manufactured with different storage capacities.
Book Type
The book type defines the specification (e.g. DVD-, DVD+, DVD-ROM) of a DVD. In order to ensure correct playback, the DVD specifications are defined in books so that all media can be read correctly. The specifications are defined in the so-called Rainbow Books, which are distinguished by means of their color (e.g. Yellow Book).


Nero DiscSpeed – Bit Setting Window