DVD Error Correction Tests

In the following tests the DVD reading capabilities of the Cyberdrive DX082D drive with scratched / defective DVD media are examined. For these 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 a 4.7GB capacity, and its surface has an artificial scratch of dimensions varying from 0.4 to 3.0 mm. The following transfer rate output was produced by the CDVD Benchmark v1.21 transfer rate test.

The CyberDrive DX082D read accurately the 821 test disc without reporting any read errors. The defective area didn't affect the reading ability of the drive. As a sidenote, the test finished at a speed of 12,8x under CAV.

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 that of the TDR-821, with the difference that instead of scratches on the surface there are defective areas of dimensions ranging from 0.5 to 1.1 mm. There are also fingerprints sized between 65 and 75 micrometers.

Once again the drive bypassed the defective area and gave an accurate reading without errors. The speed reached at the end of the test was 12,8x under CAV.

- 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, in both layers.

Although the transfer rate graph above is not solid, CyberDrive finished the test without reporting any errors. Once again the defective area in each layer was bypassed by the drive.

ABEX TDR-845

This test 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 TDR-845 includes defective areas and fingerprints. The dimensions of the defective areas range from 0.5 to 1.1 mm and the fingerprints are sized from 65 to 75 micro meters.

The CyderDrive finished the test without reporting any reading errors, although the reading graph is not smooth.

ABEX TDV-541

The TDV-541 is a single sided, dual layer DVD-VIDEO disc, with a capacity of 8.5GB.The disc is based on the TDV-540 series which is designed for inspection and adjustment of DVD-VIDEO players. The disc checks the layer switch operation from layer 0 to layer 1 and also includes test pictures and test signals for DVD sound files. The current TDV-541 also checks the error correction capabilities of the drive and includes scratches sized from 0.4 to 3.0 mm.

The CyberDrive DX082D read the 541 test disc very easily notwithstanding the reduction of speed at the beginning of the first layer. The starting speed was 3.17x, peaking at 7.62x and having an average speed of 5.72x.

ABEX TDV-545

The TDV-545 test 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 0.4 to 1.0 mm. It also has 65 - 75 micrometer fingerprints.

As can be seen in the following screen shot from Nero CDspeed, the drive showed smooth performance and finished the test accurately. It is interesting to note that the maximum speed reached was exactly the same as in the previous test with teh 541 test disc in all modes.