Memorex D² External Recorder - Page 4
DVD Error Correction
In the following tests, we examine the DVD reading capabilities of
the Memorex D² External drive with scratched / defective
For the tests we used Nero CDSpeed and not the usual CDVD Benchmark since it couldn't recognize the external drive. The reference test
- Single Layer media
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
The Memorex D² External read the disc accurately and no read errors
This graph shows very
capabilities with scratched, single layer DVD-ROM discs.
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
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
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.
Again, excellent error correction with DVD double
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.
The drive kept on producing excellent graphs, indicating high DVD error correction capabilities.
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.
Although the Abex TDV-541 test media is a difficult test for most recorders,
the Memorex external recorder passed it without any difficulties.
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
The drive proves to be an excellent reader, when it comes to defective media.
The performance of the Memorex F16 with DVD defective media was nothing short