So this is the fundamental question: Is there a greater chance for a
manufacturer to ?incorrectly implement? the DVD standard more, than
the CD standard? And if so, what are the leading factors? A Perfect
implementation is never possible, simply due to the nature of all
things mechanical and human.
Said another way: Given the differences in standard and format for a
basic drive reader (of both) and a basic factory pressed disc (for
both) does there exist the possibility of more unreliably reading data
from a DVD implementation than a CD implementation.
Here is my original question as well as some examples, I re-wrote the
above statement for clarity:
On a general whole, are CD's and CD-ROM drives any more reliable than
DVD's and DVD-ROM Drives? In my personal experience I have found this
to be true, but I am looking for some more quantitative proof.
Initially ignoring such things as disk format differences, and then
factoring that in, is the Implementation of a CD and CD-ROM Drive any
more reliable than the implementation of a DVD and a DVD-ROM drive?
For example: If a 1,000,000's CD's are pressed, and a 1,000,000 DVD's
are pressed does the possibility exist that 98% of the CD's read
correctly where only 95% of the DVD will read correctly? That is
fundamental question. I have done some basic research on my own trying
to factor in such things as firmware complexity for supporting
competing non-standard formats (DVD+ vs. DVD-), laser algorithm
complexity, disk spin dynamics and the algorithms required to address
them etc... But without statistical proof, it's impossible to draw any
definitive conclusions. |
Request for Question Clarification by
bobbie7-ga
on
22 Sep 2006 10:55 PDT
Hello idarwin,
Please download and review two studies I located for you.
Would the statistics in these publications work for you?
Bobbie7
Stability Comparison of Recordable Optical Discs?A Study of Error
Rates in Harsh Conditions
National Institute of Standards and Technology, Gaithersburg, MD
Download here:
http://www.itl.nist.gov/div895/gipwog/StabilityStudy.pdf
?The reliability and longevity of any storage medium is a key issue
for archivists and preservationists as well as for the creators of
important information.
This is particularly true in the case of digital media such as DVD and CD where
a sufficient number of errors may render the disc unreadable. This
paper describes an initial stability study of commercially available
recordable DVD and CD media using accelerated aging tests under
conditions of increased temperature and humidity.?
?Initial results show that high quality optical media have very stable
characteristics and may be suitable for long-term storage
applications. However, results also indicate that significant
differences exist in the stability of recordable optical media from
different manufacturers.?
------------------------------
The Relative Stabilities of Optical Disc Formats
Donwload here:
http://www.uni-muenster.de/Forum-Bestandserhaltung/downloads/iraci.pdf#search=%22study%20cd%20dvd%20reading%20%20reliability%20percent%22
CONCLUSIONS
?The disc format with the best survival percentage is the CD-R using
the phthalocyanine dye. If longevity is a requirement when selecting a
disc format, then the CD-R with phthalocyanine dye is a better choice
than the other available CD or DVD formats. The silver metal
reflective layer performed well, but if the environment is less than
ideal, then a gold metal reflective layer will provide better
stability.?
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