Philips DVDR1640P DL Recorder -
Page 4
DVD Error Correction
Tests
In the following tests we examine the DVD reading capabilities of the drive 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
ABEX TDR-821
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
rate test.
The DVDR1640P read the disc successfully while it reached a top
speed of 16X CAV. The scratched area did not affect the reading process. The
performance
reveals 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.
Again, the drive read the disc without reporting any read errors.
Once again the reading speed at the end of the task was at 16X.
- 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.
No errors were reported and the process finished successfully.
ABEX TDR-845
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
defective areas and fingerprints.
The dimensions of the defective areas range
from 0.5 to 1.1 mm and the fingerprints are sized from 65 to 75 micro meters.
The TDR-845 test
disc was not a problem for the drive.
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.
The Philips drive just ignored the defective area...
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.
The DVDR1640P showed excellent behavior with TDV-545 test
disc. Linear, smooth graph means very good performance.
