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NeroLINUX Glossary •
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• 48
Track
On an audio CD a track corresponds to a piece of music. On a data CD a track is
a unit of data which joins consecutive sectors together.
Track-at-Once
This is a method of writing data which is used for multisession CDs. The CD-RW
drive writes all the tracks one after another and does not end the session until
this is finished.
UDF (Universal Disk Format)
This is a file system developed by OSTA (the Optical Storage Technology
Association). With a UDF driver and packet writing, data can be written to a CD
drive in the same way as to a hard disk or floppy disk drive.
Volume descriptor
The volume descriptor is added to every CD track. It contains information such as
the creation data, the publisher, the title etc. The volume descriptor has a special
significance for formats such as Video CD, Photo CD and CD-i. The volume
descriptor on these types of CD includes information about the program to be
used for reading the data on the CD.
Virtual Image
A virtual image is a project file which contains only references to the files which
are to be written to CD.
VQF
VQF or TwinVQ is a process developed by NTT Human Interface Laboratories to
compress audio information. It has been developed in competition with MP3.
Yamaha calls this process Sound VG. VQF files of similar quality are smaller than
MP3 files but larger than mp3PRO files. More processor power is used in the
decoding process than is the case with MP3 files.
White Book
The White Book is a standard which is more commonly called Video CD.
XSVCD (Extended Super Video CD)
XSVCD stands for Extended Super Video CD. The difference between this and
SVCD is that the average bit rate can be anything up to 9.8 Mbit/s, whereas with
SVCD it is 2.6 Mbit/s. Unfortunately not all drives which can read Super Video
CDs support this format.
XVCD (Extended Video CD)
XVCD stands for Extended Video CD. The difference between this and Video CD
is that the bitrate can be anything up to 3.5 Mbit/s, whereas with VCD it is 1.5
Mbit/s. Unfortunately not all drives which can read Video CDs support this format.