Now let’s move on to rewritable media.
DVD+RW read graphs
Whatever the firmware version, the AOpen COM5232/AAH is reading DVD+RW discs with ease. There are no pulses or slumps in the graphs. The drive reaches a speed of 8x.
It is not that simple with the Samsungs. The SM-352N model did the reading of the DVD+RW disc well enough, although more slowly than the other two drives, finishing at 6x speed, but the TS-H492A was reading hesitatingly since the second half of the disc. The closer it got to the end of the disc, the stronger was the pulse. Anyway, the drive read the disc through to the end and without any significant speed losses, but this behavior is alarming all the same.
DVD-RW read graphs
The AOpen COM5232/AAH finds it more difficult to read this type of media – it was better with +RWs. There’s throbbing at the beginning of the disc. Its amplitude is smaller after the firmware update, but it is still here.
Both models from Samsung performed the reading of the DVD-RW excellently, producing smooth and clear graphs.
Overall, the AOpen COM5232/AAH is again the best with rewritable DVDs. The SM-352N had a good result, but it is slower than the AOpen. The only gripe about the Samsung TS-H492A is that it is unconfident at reading DVD+RW discs. So, all the three drives are quite successful at reading written DVD discs.
As a conclusion to this section of the review, I would like to say a few words about the compatibility of the drives with dual-layer DVD+R discs. The specifications of the devices do not mention such compatibility, but let us check it out anyway.
As you can see in the pictures, the AOpen was the only drive to see a dual-layer DVD+R disc, but it couldn’t recognize it correctly or read a layer to the end. The new firmware version doesn’t cure this – the read error occurs at the same point. Both Samsungs refused to identify the inserted dual-layer DVD+R disc.
So, the specifications were right – Not Supported. We should wait for new firmware versions.