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Home > Hardware Reviews > Optical Storage > DVD Recorders 12x

Thursday, July 29, 2004
Optorite_DD1203

4. DVD Error Correction Tests

Optorite DD1203 Dual DVD±RW Recorder - Page 4

DVD Error Correction Tests

In the following tests we examined the DVD reading capabilities of the DD1203 drive with scratched / defective DVD media. For the tests we used CDVD Benchmark and Nero CDSpeed. The reference test media come 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 graph comes from the CDVD Benchmark v1.21 transfer rate test.

Generally a clean performance, just a few speed deviations especially over the more difficult areas as shown by the collection of yellow dots becoming more dense as reading progresses over the defective area.

ABEX TDR-825

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

Both single layer test media were not a problem for the DD1203 drive. So far, DVD error correction is impressive.

- Dual Layer media
ABEX TDR-841

This is a 8.5GB dual layer, single sided DVD-ROM disc with artificial scratches of dimensions ranging from 0.4 to 3.0mm, in both layers.

The drive read both layers without any major problems, however the reading strategy changed from CAV to CLV when it met with problems while reading over the defective region.

ABEX TDR-845

The disc is a single sided, dual layer DVD-ROM disc of 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 range from 0.5 to 1.1 mm and the fingerprints are sized from 65 to 75 micro meters.

Excellent performance...

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 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 correcting capabilities of the drive and includes scratches from 0.4 to 3.0 mm.

Click for full graph

Although the reading started normaly, after a while the drive needed to slow down in order to read the contents of the disc on the defeactive area. However, no errors were reported and the task finished successfully.

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 0.4 to 1.0 mm. It has also 65 - 75 micro meters fingerprints.

Click for full graph

Black dots and fingerprints on the disc's surface did not create any reading problems.

- Summary

The DVD error correction of the Optorite drive is in general, very good.




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