DVD Error Correction tests

In the following tests we examine the DVD error correction capabilities of CyQ've 2400Plus. For the tests we used CDVD Benchmark v1.21 and Nero DVD Speed . The reference test media comes from ALMEDIO.

- Single Layer media

ABEX TDR-821

This is a single sided, single layer DVD-ROM with a 4.7GB capacity, in which there are scratches with dimensions from 26 to 48 mm. The following picture comes from CDVD Benchmark v1.21.

CyQ've 2400Plus did not manage to finish the reading test. The requirements of the test exceeded the drive's error correction capabilities and serious read errors were occurred by the end of the test, making the drive unable to read all the disc contents.

ABEX TDR-825

This is also a single sided, single layer DVD-ROM with a 4.7GB capacity. The data structure of the disc is exactly the same as the TDR-821, with the difference that there no scratches on it but defected areas with dimensions from 0.5 to 1.1 mm. There also fingerprints sized from 65 to 75 mm.

The drive did not have any problems to read the disc contents. As you can see from the above graph, the yellow dots correspond to the current speed in each area of the disc. No read errors were reported.

- Dual Layer media

ABEX TDR-841

This is a 8.5GB dual layer, single sided DVD-ROM disc with artificial scratches with dimensions from 0.4 to 48 mm, in both layers.

The CDVD Benchmark showed that the drive cannot handle heavily scratched DVD-ROM media. The drive stopped reading by the end of the first layer, and the test was terminated. The result was expected, since the CyQ've 2400Plus had previously failed to successfully finish the single layer scratched DVD-ROM reading test.

ABEX TDR-845

The disc is a single sided, dual layer DVD-ROM disc with a capacity of 8.5GB. The only difference between the TDR-845 and the TDR-841 is that the first includes defected areas and fingerprints. The dimensions of the defected areas are ranged from 0.5 to 1.1 mm and the fingerprints are sized from 0.065 to 0.075 mm.

CyQ've 2400Plus did not have any problems to overcome the defected areas and successfully finished the reading test.

ABEX TDV-541

The TDV-541 is a single sided, dual layer DVD-VIDEO disc, with capacity of 8.5GB. The disc is based upon the TDV-540 series which is designed for inspection and adjustment of DVD-VIDEO players. The discs check the layer switch operation from layer 0 to layer 1 and also include test pictures and test signals for DVD sound files. The current TDV-541 checks also the error correction capabilities of the drive and includes scratches from 1.8 to 3 mm.

For another time, the CyQ've gave a read error in the scratched areas of the test disc, and the test was terminated.

ABEX TDV-545

The TDV-545 disc is based on the TDV-540 series. It is a single sided, dual layer DVD-VIDEO disc with a capacity of 8.5GB. The TDV-545 includes artificial black dots on the data surface, sized from 0.8 to 1.0 mm. It has also 0.065 - 0.075 mm fingerprints.

Black dots and fingerprints were not a problem for the drive. The test was successful, and the layer change time was 149msec.