In the following tests, we examine the DVD reading capabilities of
the LiteOn SOHW-1673S 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 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 1673S was capable of reading the 821 test media reporting some speed
fluctuations near the completion of the reading, due to the drives correction
mechanism. Notice that at this point the speed was near 16X.
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
Once again good reading and would have been a great one if not for the
drop in speed right before the second defective area with the fingerprints.
- 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.
The performance here is also good and it would be absolute perfect if not
for the speed drop at the end of the second defect.
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.
This time the transfer rate graph was very good. No errors reported.
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.
What we have here is a nearly excellent performance with a test disc which
usually produces average results with many common drives. But in this
case, we can only see a wobble in speed after the start of the second layer.
Nicely done by the 1673S.
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
Excellent, smooth graph.
With what can be classified as a better than average error correction
mechanism, we move on to the protected disc tests of this review
of the 1673S burner.