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

Thursday, December 02, 2004
Waitec Action16

4. DVD Error Correction Tests

Waitec Action 16 Recorder - Page 4

DVD Error Correction Tests

In the previous test, we examined how the Action 16 handles the defective audio discs. Now, in the following test we will see the reading capabilities of the Action 16 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

The following transfer rate picture comes from CDVD Benchmark v1.21 transfer rate test, using a single sided, single layer DVD-ROM with 4.7GB capacity, with an artificial scratch emended on the disc ranging from 0.4 to 3.0 mm.

The Action 16 proved capable of reading the defective/scratched test disc without errors, but with a slight drop of speed near the end, in order to achieve good reading.


Similar to the TDR-821 the TDR-825 is a single sided, single layer DVD-ROM of 4.7GB capacity. The difference between the two discs is that the later emulates not a scratch but a group of defective areas with dimensions ranging from 0.5 to 1.1 mm and fingerprints sized about 65 to 75 micrometers.

As we can see in the graph above, the Action 16 performed well reading the disc, without errors, even though there was a drop in speed in the middle of the disc, just before the fingerprints and at the end of the test, providing us once again with a very good reading.

- Dual Layer media

Let us see how the Action 16 does in reading an 8.5GB single sided, dual layer DVD- ROM with artificial scratches of dimensions ranging from 0.4 to 3.0mm, located on both layers.

The smoothest reading until now, the Action 16 did extremely well when reading both layers, same speed and error correction quality, one of the smoothest and cleanest graphs CDVD Benchmark has returned.


Much like the TDR-841, the TDR-845, a single sided, dual layer DVD-ROM disc with a capacity of 8.5GB differs from the first disc in the fingerprints contained in both layers along with the scratched areas. The dimensions of the defective areas ranges from 0.5 to 1.1 mm and the fingerprints are sized from 65 to 75 micrometers.

Once again, good performance, no errors, slight drop in speed in both layers just before the fingerprints.


Using Nero CdSpeed we tested the drive with the TDV-541, a single sided, dual layer DVD-VIDEO disc, with a capacity of 8.5GB. Based in the 540 series for inspection and calibration of DVD-VIDEO players, the TDV-541 inspects the layer layer switch operation and the error correction capabilities of the drive, including scratches ranging from 0.4 to 3.0 mm.

click to enlarge!

The Action 16 performed well in reading the test disc. It would have been a great reading if it was not for the speed drop just before the layer change.


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.

click to enlarge!

The artificial black dots and fingerprints were no match for the error correction capabilities of the Action 16, as it can be clearly seen in the graph above...

- Conclusion

All the graphs above indicate that the drive has high DVD error correction capabilities.

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