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Home > Hardware Reviews > Optical Storage > DVD External

Wednesday, November 03, 2004
Memorex Dē External

4. DVD Error Correction Tests

Memorex D² External Recorder - Page 4

DVD Error Correction Tests

In the following tests, we examine the DVD reading capabilities of the Memorex D² External drive with scratched / defective DVD media. For the tests we used Nero CDSpeed and not the usual CDVD Benchmark since it couldn't recognize the external drive. 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.

click to enlarge!

The Memorex D² External read the disc accurately and no read errors were reported. This graph shows very good error correction capabilities with scratched, single layer DVD-ROM discs.

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 instead, defective areas of dimensions ranging from 0.5 to 1.1 mm. There are also fingerprints sized between 65 and 75 micrometers.

click to enlarge!

The same behavior was observed with this media type. No read errors were introduced, as if there were no defective areas or fingerprints on the disc.

- 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.

click to enlarge!

Again, excellent error correction with DVD double layer media.

ABEX TDR-845

This test 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 discs is that the first includes defective areas and fingerprints. The dimensions of the defective areas ranges from 0.5 to 1.1 mm and the fingerprints are sized from 65 to 75 micrometers.

click to enlarge!

The drive kept on producing excellent graphs, indicating high DVD error correction capabilities.

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 on 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.

click to enlarge!

Although the Abex TDV-541 test media is a difficult test for most recorders, the Memorex external recorder passed it without any difficulties.

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 also has 65 - 75 micrometer fingerprints.

click to enlarge!

The drive proves to be an excellent reader, when it comes to defective media.

- Conclusion

The performance of the Memorex F16 with DVD defective media was nothing short of excellent.




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