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Home > Hardware Reviews > Optical Storage > DVD External

Thursday, April 27, 2006
LiteOn SLW 831SX

4. DVD Error Correction

In the following tests, we examine the DVD reading capabilities of the LiteOn SHM-165P6S 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.

The maximum reading speed achieved was 8X with no drops in speed.

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.

Once more, maximum reading speed with this media was 8X, while we had smooth reading all the way to the end. The drive passed over both defective areas without producing any errors.

- 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.

With DL media, the maximum speed was 6X on both layers, while no errors were reported and the reading was completed successfully.

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.

Same performance as with the 841 DL media. The scattered yellow dots in the graph are instantaneous speed changes, which however, did not affect the reading of this test disc.

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!

Excellent performance with the 541 media. Both layers were read flawlessly.

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!

Same performance as with the 541 test media. Smooth reading all the way to the end.

- Conclusion

Overall, very good error correction capabilities from the Slimtype 831S drive. It read over all the defective areas, although at low speeds, and we can say that the drive is very good at handling most if not all, defective media that might crop up.




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