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Glossary
Nero Linux 50
15 Glossary
Blu-ray
Blu-ray technology refers to burning on special data carriers. In comparison to DVD's, which
use a red laser in order to read and write data, Blu-ray discs are written with a blue laser.
The shorter wavelength (405 nm) of this blue laser makes it possible to position the laser
with greater accuracy. Data can be written in a more compact manner and takes up less
space on the disc. A Blu-ray disc can store up to 25 GB on a single layer disc and up to 50
GB on a dual layer disc.
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).
Bootable CD
Booting refers to loading the operating system when a computer is started. This is normally
done from the hard drive. However, if you do not want to boot or cannot boot your computer
from your hard drive for whatever reason, you can load an operating environment from the
drive with a boot CD.
CD-R
Compact Disc-Recordable is a technology for write-once media. The Orange Book standard
defines the storage of audio data and other computer-readable data.
Image
An image refers to a single file on the hard drive that contains the image for a complete disc.
A disk image can be used to create exact copies on media at a later point in time if problems
occur during the write process or if no recorder is connected to your PC. The image requires
as much free space on the hard drive as the contents of the original disc.
Joliet
Joliet refers to an extension of the ISO-9660 standard for file names. Joliet was designed by
Microsoft in order to represent more characters. The file name can be up to 64 characters
long and contain the letters A-Z, a-z, umlauts and the ß.
MP3
The MPEG-1 Audio Layer 3 audio format is used to reduce the size of audio files to a frac-
tion of their original size (factor 1:10) with little loss of quality. You can estimate about 1 MB
per minute as opposed to 10 MB for the original files. This value and the quality can vary de-
pending on the complexity of the audio signal. The bit rate used can be used as a measure
of quality. The higher the bit rate, the better the quality, but also the more memory required.