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Glossary
Nero DiscSpeed 68
17 Glossary
A-BEX-Disc
Eine A-BEX-Disk ist eine Test-DVD, die eingesetzt wird, um die Fehlerkorrektur eines opti-
schen Laufwerkes zu testen. Hierbei ist die Test-DVD bereits ab Werk mit Fehlern, wie Krat-
zern oder Fingerabdrücken versehen, um eine Testreferenz darzustellen.
Access Time
The access time is the time a drive needs to move the read head to a specific position on the
disc that is inserted in the drive and to additionally read an area of the disc. In other words,
the access time encompasses the seek time and in addition the period of time for reading a
specific area.
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).
Buffer
A buffer refers to temporary memory that records and delivers data that cannot be processed
immediately as required. The buffer also allows for continuous data flow.
C2 errors
A C2 error describes the error rate on the lower layers of a burned CD that are automatically
corrected during reading. Every recordable disc features these errors; the fewer they are, the
better the quality. High C2 error rates indicate burn problems or quality flaws.
CD Text
CD Text consists of additional information on a CD that can store e.g. music track titles and
artists. CD Text is stored in the so-called lead-in area of the CD before the audio data starts.
The display on the CD player shows the additional data. You must have a CD burner which
supports CD Text to enable the CD Text to be written to a CD. In particular, CD Text can on-
ly be written in disc-at-once mode.
CPU usage
The central processing unit processes a computer's processes. The higher the computing
performance, the higher the load of the CPU and its performance.
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