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Home > Hardware Reviews > Optical Storage > DVD-ROM

Thursday, August 05, 2004
LiteON SOHD-167T

4. DVD Error Correction Tests

LiteOn SOHD-167T - Page 4

DVD Error Correction Tests

In the following tests we examined the DVD reading capabilities of the 167T drive with scratched / defective DVD media. For the tests we used CDVD Benchmark and Nero CDSpeed. The reference test media come 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.

The LiteOn SOHW-167T read the disc at 16X CAV and the scratched area did not affect the process. The disc was read accurately and no read errors were reported.

Below are the corresponding graphs for the LTD-163/165H:

ABEX TDR-825

This is also a single sided, single layer DVD-ROM of a 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 defective areas of dimensions ranging from 0.5 to 1.1 mm.

There are also fingerprints sized between 65 and 75 micrometers.

As before, the disc was read without any "read errors" and the test was finished successfully. There was a short duration reading speed drop just before the third step which didn't affect the process however.

Below are the graphs for the LTD-163/165H:

- 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.

The drive read both layers without any major problems, as the above graph shows. Below are the same graphs for the LTD-163/165H:

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 defects range from 0.5 to 1.1 mm and the fingerprints are sized from 65 to 75 micro meters.

The drive passed the fingerprint defects without any reading speed drop and finished the test without problems. Below are the graphs for the LTD-163/165H:

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 discs check the layer switch operation from layer 0 to layer 1 and also include test pictures and test signals for DVD sound files.

The current TDV-541 checks also the error correcting capabilities of the drive and includes scratches from 0.4 to 3.0 mm.

Click for full graph

The reading process started at 3.37X and reached 8.06X at the 4.0GB point, where the drive changed layer and reduced its reading speed till the end. The drive finished the reading process normally, without errors or problems.

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 micrometer fingerprints.

Click for full graph

Black dots and fingerprints on the disc's surface did not create any reading problems, and the drive finished the task successfully.




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