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

Friday, September 02, 2005
NEC ND-3540A

4. DVD Error Correction Tests

In the following tests we examined the DVD reading capabilities of the NEC ND-3540A 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 picture comes from the CDVD Benchmark v1.21 transfer rate test.

What we have here is error free reading with a small drop in speed over the last part of the defect region.

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.

Excellent reading. The drive managed to read over both defective areas without problems.

- 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.

This test disc proved to be a little bit harder to read and there were speed fluctuations and drops at the end of both defective regions. Still, the NEC drive managed to read over the defective areas on both layers without producing any errors.

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 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.

Very good performance with smooth lines (steady reading speed). Again, no errors reported.

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 to enlarge!

Very good error correction capabilities, with a drop in speed after the layer change.

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 meter fingerprints.

click to enlarge!

Excellent reading by the NEC drive. The artificial dots and fingerprints were no match for the drive's error correction mechanism.

- Summary

The NEC ND-3540A surely proved to have a great error correction mechanism with DVD media, much like the previous models. If DVD error correction is on any buyer's need-to-have list, then he/she will not be disappointed by this drive.




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