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Home > Hardware Reviews > Optical Storage > DVD Recorders Double Layer

Thursday, November 10, 2005
Pioneer DVR-110

3. DVD Error Correction Tests

In the following tests we examined the DVD reading capabilities of the drive with scratched / defective DVD media. For the tests we used CDVD Benchmark and Nero CDSpeed. 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, 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.

The first test of the DVD error correction series was completed successfully, with a smooth line and a 16X max reading speed. No errors were reported.

ABEX TDR-825

This is also a single sided, single layer DVD-ROM of 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 instead, defective areas of dimensions ranging from 0.5 to 1.1 mm.

There are also fingerprints sized between 65 and 75 micrometers.

Same performance here, this time with two defective areas on one layer and the drive made quick work reading past both areas without any reported errors or drops in speed.

- 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 max supported reading speed for DL media with the 110 is 12X as reported in the manufacturers specs. Both layers were scanned over with ease and no errors were encountered whatsoever.

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 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.

In this case, reading over the first layer produced some minor speed drops as can be seen by the sporadic yellow dots. The second layer was read much easier by the drive, while overall, the 110 managed to read over both defective areas/layers with no major costs in speed. Again, the max reported speed was 12X.

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 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.

Even though the drive managed to read over the defective areas on the test media, during the second layer, the reading speed was reduced substantially.

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.

The previous model 110D, did not manage to achieve a full reading of this test media. With the upgraded 110, this media, as we can see from the above graph, was read flawlessly.

Overall great DVD error correction, while the drive will read almost every defective inserted media.




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