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Home > Hardware Reviews > Optical Storage

Wednesday, December 26, 2007

4. DVD Error Correction

In the following tests, we examine the DVD reading capabilities of the drive (error correction) 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


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.

Pretty smooth results with this artificially scratched, single layer DVD-ROM from ABEX.


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.

Speed drop from 12X to 4X when the LITE-ON drive reaches the artificial fingerprint, but otherwise smooth reading.

- Dual Layer media


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 is a slightly worrying graph. The first layer was successfully and flawlessly read, while the drive made heavy going of the second layer. The artificial defects on the second layer caused quite a few problems for the LITE-ON although it did complete the reading process and there were no errors.


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.

Drops in reading speed just after the first defect on both layers of the disc.


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 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.

Smooth graphs and positive results with both the DVD-VIDEO discs.

The DVD Error Correction mechanism of the LITE-ON drive produced mediocre results, having had trouble with the second layer in some of the dual layer test discs.

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