Optorite DD1203 Dual DVD±RW Recorder - Page 4
DVD Error Correction
In the following tests we examined the DVD reading capabilities of
the DD1203 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 graph comes from the CDVD Benchmark v1.21 transfer
Generally a clean performance, just a few speed deviations especially
over the more difficult areas as shown by the collection of yellow dots becoming
more dense as reading progresses over the defective area.
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
Both single layer test media were not a problem for the DD1203 drive. So far,
DVD error correction is impressive.
- Dual Layer media
This is a 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 read both layers without any major problems, however the reading
strategy changed from CAV to CLV when it met with problems while reading over
the defective region.
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.
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.
Although the reading started normaly, after a while the drive needed to slow
down in order to read the contents of the disc on the defeactive area. However,
no errors were reported and the task finished successfully.
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 did not create
any reading problems.
The DVD error correction of the Optorite drive is in general,