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Home > Hardware Reviews > Optical Storage > DVD External

Wednesday, May 17, 2006
LG GSA-2166D

4. DVD Error Correction

In the following tests, we examine the DVD reading capabilities of the LG GSA-2266D 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 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.

Without errors or drops in speed and at a maximum reading speed of 8, the drive managed to read this SL test media all the way to the end.

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.

Here too, this time with SL media, the drive again managed to read through to the end without error or any significant drops in speed (yellow dots).

- 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.

In this test, the drive read through both layers at a maximum reading speed of 8X. There were no errors or significant drops in speed.

ABEX TDR-845

This test 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 discs is that the first includes defective areas and fingerprints. The dimensions of the defective areas ranges from 0.5 to 1.1 mm and the fingerprints are sized from 65 to 75 micrometers.

Very good 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 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!

Even though CDSpeed reported some fluctuations in speed during the second layer, the drive managed to successfully complete the reading process in 19:06mins.

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 to enlarge!

Smooth reading, no speed fluctuations whatsoever. Good performance.

In all cases, the maximum reading speed was 8X. The drive did not drop speed while reading over the defective areas with any of our test discs except for the 541 test disc, but it still managed to complete the test without errors. Overall, very good error correction capabilities. The only comment would be perhaps a faster reading speed.




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