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

Thursday, August 26, 2004
TEAC DV-W512G

4. DVD Error Correction Tests

TEAC DV-W512G Dual DVD±RW Recorder - Page 4

DVD Error Correction Tests

In the following tests we examined the DVD reading capabilities of the drive with scratched / defectivee 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 picture comes from the CDVD Benchmark v1.21 transfer rate test.

The TEAC DV-W512G read the disc at 12X P-CAV and the scratched area did not affect the process. The disc was read accurately and no read errors were reported.

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 only defectivee areas of dimensions ranging from 0.5 to 1.1 mm.

There are also fingerprints sized between 65 and 75 micrometers.

As before, the disc was read without any "read errors" and the test was finished successfully.

- 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, on both layers.

The drive read both layers without any major problem, as the above graph shows.

ABEX TDR-845

The disc is a single sided, dual layer DVD-ROM disc of 8.5 GB capacity. The only difference between the TDR-845 and the TDR-841 is that the first 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 micrometers.

The drive passed the fingerprint defective area without any reading speed drop and finishes the test without problems.

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

Click for full graph

The reading process started at 3.41X and reached 8.015X at the 4.0GB point, where the drive changed layer and started reducing its reading speed up until the end. There are some minor glitches at the start of the second layer which aren't indicative of any serious reading problems and the drive finished the reading process without problems.

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 also has 65 - 75 micrometer fingerprints.

Click for full graph

Black dots and fingerprints on the disc's surface did not create any reading problems, and the drive finished the task successfully.




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