5. DVD Error Correction Tests
DVD Error Correction Tests
In the following tests we examined the DVD error correction capabilities of the TS24C-C1. For the tests we used CDVD Benchmark v1.21 and Nero DVD Speed . The reference test media comes from ALMEDIO.
- Single Layer media
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.
INcoder TS24C-C1 seems to have no problem finishing the reading task with no errors. The drive lowered the reading speed to 4X (average) when it reached the 500.000 sector, according to the software. The reading speed is kept at 4X for until the end of the reading process. No read error were occurred.
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.
The drive did not have any problems to read the disc contents. The yellow dots correspond to the current speed in each area of the disc. No read errors were reported.
- Dual Layer media
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.
The result is very good, as it was expected, judging from the reading test with the single layer disc. If you compare the two yellow transfer lines with the one we had in the TDR-821 test, you will see that the drive showed a similar good reading behavior, in both layers.
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.
This time, the drive lowered the reading speed by the time the defect became large enough, in the first layer. In that point some read errors occurred. The problem was not replayed in the second layer.
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.
The drive gave a 3.17X average reading speed for the DVD-Video format. The scratched areas made the drive slow down momentarily but it seems that there were no reading problems. The layer change time 44 msec, and the seek times were not different from those the drive gave with a data DVD-ROM.
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.
Black dots and fingerprints were not a problem for the drive. The test was successful, with an 3.17X average speed and 56 msec for the layer change time.