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Home > Hardware Reviews > Optical Storage

Friday, October 22, 2010
Optiarc AD 7260S review

4. Reading of defected DVDs

In the following tests, we examine the DVD reading capabilities of the drive with scratched / defective DVD media (error correction). For the tests, we used Nero DiscSpeed. 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 reading process was completed successfully, although the drive slowed down in the beginning of the disc.

Optiarc AD-7260S Optiarc AD-7240S LiteOn iHAS524
Read errors No, slowdowns in the beginning No No

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.

 

 

No reading problems here.

Optiarc AD-7260S Optiarc AD-7240S LiteOn iHAS524
Read errors No No No

- 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.

 

Same as before, successful reading without any speed fluctuations or read errors.

Optiarc AD-7260S Optiarc AD-7240S LiteOn iHAS524
Read errors No No No

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.

 

 

Great reading here.

Optiarc AD-7260S Optiarc AD-7240S LiteOn iHAS524
Read errors No Yes No

 

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.

Optiarc AD-7260S Optiarc AD-7240S LiteOn iHAS524
Read errors Yes No Yes

This time a read error was reported before the drive shift from layer 0 to layer 1 of the disc.

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.

Flawless reading here.

Optiarc AD-7260S Optiarc AD-7240S LiteOn iHAS524
Read errors No No No

Summary

Overall, the DVD error correction mechanism is good although it could be even better, especially with scratched dual layer DVD-VIDEO discs.




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