Memorex True 8Xn
Recorder - Page 4
DVD Error Correction
In the following tests we examined the DVD reading capabilities of
the Memorex drive with scratched / defective
For the tests we used CDVD Benchmark and Nero CDSpeed . The reference test
- Single Layer media
This is a single sided, single layer DVD-ROM with a 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 drive did not read
the whole disc, and we see that errors were produced at the end of the defective
area on the disc's surface where the reading process stopped.
This is also a single sided, single layer DVD-ROM of a 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 defected areas of dimensions
ranging from 0.5 to 1.1 mm. There are also fingerprints sized between 65 and
The ABEX TDR-825 disc was read without any problems.
The test was finished successfully without errors.
- 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, in both layers.
The drive didin't make it past the ABEX TDR-841 test disc either, producing
many read errors and in general having a lot of problems with the defects.
The disc is a single sided, dual layer DVD-ROM disc of 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 range
from 0.5 to 1.1 mm and the fingerprints are sized from 65 to 75 micro meters.
Again a lot of problems with the defects, and while the drive finished reading,
it produced a lot of errors.
The TDV-541 is a single sided, dual layer DVD-VIDEO disc, with a 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 correcting capabilities
of the drive and includes scratches from 0.4 to 3.0 mm.
The drive couldn't read the ABEX TDV-541 test disc at all.
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
Black dots and fingerprints on the disc's surface created some reading
problems, but the drive finished the task successfully.