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Home > Hardware Reviews > Optical Storage > DVD Recorders Double Layer

Friday, July 30, 2004
LG GSA-4120B

4. DVD Error Correction Tests

LG GSA-4120B DL Recorder - Page 4

DVD Error Correction Tests

In the following tests we examined the DVD reading capabilities of the 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 drive can read DVD media up to 10X. The scratched area did not affect the reading process. The LG drive showed very good behaviour with this disc, and no errors were produced.

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 defective areas of dimensions ranging from 0.5 to 1.1 mm.

There are also fingerprints sized between 65 and 75 micrometers.

Again, the drive didn't have problems reading this test disc. We can see that the line is continuous, a little dense but the defects did not produce any anomalies.

- 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.

.

As seen above, once again the drive did not encounter any problems reading 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 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 current TDV-541 also checks the error correcting capabilities of the drive and includes scratches from 0.4 to 3.0 mm.

As is evident from the screenshot above, the drive lowered its reading speed when it entered the area where the test disc includes the scratch. Despite this, the drive finished its reading process without any 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 disc's surface, sized from 0.4 to 1.0 mm. It also has 65 - 75 micrometer thickness, fingerprints.

Click to enlarge!

No problems here for the drive, a perfect curve with good performance.




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