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Disc Quality tab
8 Disc Quality tab
8.1 Quality Test
The Disc Quality test is often referred to as Scan, and can be run on the Disc Quality tab.
You can choose between a quick scan and a complete scan. The quick scan only checks
defined points on the disc. All other areas are ignored. As a result, it requires less time than
a complete scan but is less accurate. This test is particularly useful for burned discs. It can
only be run reliably with a recorder; a simple reader is not sufficient.
The results are displayed in two graphs: the top one shows the results for C1 errors
/PI errors
(for CD's and DVD's respectively), while the bottom one shows the results for C2 errors
/PI
failures (for CD's and DVD's respectively). In the top graph, the vertical scales on the left
show the number of C1 errors/PI errors and the vertical scales on the right show the
write
/read speed. In the bottom graph, the vertical scales on the left show the number of C2
errors/PI failures and the vertical scales on the right show the jitter
value. The horizontal sca-
le in both graphs shows the disc capacity, in MB for CD's and in GB for DVD's.
If you want to omit a protected area from the bottom graph, enable the Use
background to show error limits check box in the options under the Disc
Quality navigation entry.
In addition, both test results and data on the test in progress are shown in the Disc info area
and in a number of other display panels to the right of the graph. In the PI errors, PI Fail-
ures, and Jitter areas under the graph, information on the disc quality is displayed in real-
time while the test is run. The number of PO failures is also shown here.
Nero DiscSpeed 39
39


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