Feurio Questions & Answers - Explanation of
Terminology:
Oversized CD-Rs (80-Minute CD-Rs)
A "normal" CD-R has got a capacity of 74 minutes.
However, there are also so-called "oversize" CD-Rs with a capacity of 80 minutes.
80 minute CD-RS are actually "illegal". According to the Red-Book (the standard
for CDs), a CD has got a maximum of 74 minutes.
The 80 minute CD-RS are created by "stretching" the specification:
Every CD has got a track on which the data is recorded (the same as on a vinyl
record). The spacing of the track and the maximum start and end position are
precisely defined. This thus normally provides a good 74 minutes. The spacing
of the track is given with a certain amount of tolerance. The tolerance value
is normally used to equal out imprecision in the optics or on the CD.
If however, the tolerance value is always used right to the limit, i.e. the tracks
are packed as closely together as possible, then an 80 minute CD-R is created.
As however there is no longer a "safety reserve" available, then the slightest
deviation on the CD or in the optics of the CD burner inevitably leads to an
error.
So in particular with 80 minute CDs, the manufacturer plays a greater role than
with "normal" CDs: Although small deviations in the track with "normal" 74 minute
CDs are no problem (they are "balanced out" by the tolerances), with 80 minute
CDs they mean the end.
On this, see also: "I've got problems with 80 minute
CD-Rs".
See also:
Questions and Answers - Explanation of terminology
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