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
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 DW1625 BenQ drive did not encounter any problems whatsoever during this error correction test with scratched DVD-ROM media. Climbing up to 16X speed, it passed smoothly over the defective area.
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
ranging from 0.5 to 1.1 mm.
There are also fingerprints sized between 65 and
Once again, error free reading, indicating great error correction with the 1625 drive.
- 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.
Smooth graph all the way to the end and over both layers.
The 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 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.
As we can see, the 845 test disc was no problem for the DW 1625 drive's mechanism, producing yet another smooth graph.
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
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.
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.
Both graphs show excellent error correction mechanism. All smooth to the end of the reading except for a small drop in speed with the 545 test disc. Well done.