DVD Error Correction Tests

In the following tests we examined the DVD reading capabilities of TOSHIBA DVD-ROM SD-R5112 drive with scratched / defected 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, in which there are scratches with dimensions from 0.4 to 3.0 mm. The following transfer rate picture comes from CDVD Benchmark v1.21.

The disc was read without problems. Toshiba finished the test fast, but had to slow down momentarily at the most effected area of the disc. No errors were reported.

ABEX TDR-825

This is also a single sided, single layer DVD-ROM with a 4.7GB capacity. The data structure of the disc is exactly the same as the TDR-821, with the difference that there not scratches on it but defected areas with dimensions from 0.5 to 1.1 mm. There also fingerprints sized from 65 to 75 micro meters.

Again the test was completed fast and without any read errors. The drive bypass the effected areas of the discs without slowing down and the reported end speed was about 12X.

- Dual Layer media

ABEX TDR-841

This is a 8.5GB dual layer, single sided DVD-ROM disc with artificial scratches with dimensions from 0.4 to 3.0mm, in both layers.

Both layers of the PTP DVD-ROM disc were accurately read. The drive gave back the same performance with the 821 single layer DVD-ROM slowing down momentarily at the end of the effected area on both layers. Once again no errors were reported.

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 defected areas and fingerprints. The dimensions of the defected areas are ranged from 0.5 to 1.1 mm and the fingerprints are sized from 65 to 75 micro meters.

The TDR-845 test disc was read accurate by the Toshiba drive, which ignored the defected areas and the test finished successfully.

ABEX TDV-541

The TDV-541 is a single sided, dual layer DVD-VIDEO disc, with 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 correction capabilities of the drive and includes scratches from 0.4 to 3.0 mm.

 

This disc was harder to be read. Although the first layer was read accurate, at the beginning of the second layer the speed was decreased from 8.2X to 6.2X. That speed is kept for a few sectors and then the drive spin up again to 7X and the test finish without reading errors. Because of this performance we check playability of the specific DVD Video disc with Power DVD software. We have to admit that there were no problems during the movie and the playback finished successfully.

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 micro meters fingerprints.

 

 

On this test the drive read the contents of the disc without any read errors. The reported average speed was 6.29X.