NU Combo DBW-521
5. DVD Error Correction Tests
Review Pages
2. Data CD Reading Tests
3. CD Error Correction Tests
4. DVD reading tests
5. DVD Error Correction Tests
6. Protected Disc Tests
7. DAE Tests
8. CD Recording Tests
9. Writing Quality Tests - 3T Jitter Tests
10. Writing Quality Tests - C1 / C2 Error Measurements
11. Conclusion
NU COMBI DBW-521 - Page 5
DVD Error Correction Tests
In the following tests we examined the DVD reading capabilities of the NU with scratched / defective DVD media. For the tests we used CDVD Benchmark and Nero CDSpeed. The reference test media came from ALMEDIO.
- Single Layer media
ABEX TDR-821
This
is a single sided, single layer DVD-ROM with 4.7GB capacity, and its surface
has an artificial scratch of dimensions varying from 0.4 to 3.0 mm. The following
transfer rate picture comes from the CDVD Benchmark v1.21 transfer rate test.
The first test with the NU combo drive indicates that the device may be weak in the area of DVD error correction. The drive logged in read errors during the reading process of this relatively simple test disc from Abex, the 821 test disc. The tested NU device had problems reading the first stages of the defective area, in the inner part of the disc where the read errors occurred (red dot on the graph). Despite the read error, the overall strategy of the drive was not affected, with the drive changing reading speeds to overcome this initial hurdle. The CAV reading strategy was maintained with no other errors occurring.
ABEX TDR-825

The above screenshot defies the initial indications as to the drives capabilities when it comes to DVD error correction. The 825 Abex test disc is more difficult than the previous test disc, but it posed no problems for the NU. The drive read all defective areas without problems and the test finished without read errors.
- Dual Layer media
ABEX TDR-841
This is an 8.5GB dual layer, single sided DVD-ROM disc with artificial scratches of dimensions ranging from 0.4 to 3.0mm, on both layers.
The NU managed to read the first dual layer test disc without problems. Both layers were read quickly, and without read errors.
ABEX TDR-845

Once again very good reading performance. Fast reading speed without errors throughout the test.
ABEX TDV-541

The drive managed to read and finish the 541 ABex test discs without errors and without problems during the layer switch.
ABEX TDV-545

This disc was not problem for the NU drive.
Review Pages
2. Data CD Reading Tests
3. CD Error Correction Tests
4. DVD reading tests
5. DVD Error Correction Tests
6. Protected Disc Tests
7. DAE Tests
8. CD Recording Tests
9. Writing Quality Tests - 3T Jitter Tests
10. Writing Quality Tests - C1 / C2 Error Measurements
11. Conclusion