The Opti Drive 1.47 I downloaded and installed doesn't work as expected.
There was earlier a similar software to Optidrive, which worked normally and still was freeware. Now it seems to be disappeared or is replaced with this poor chargable Opti Drive. What happened to it's predecessor and what was it's last version? Even if there was any problems, it was free and without limitations to test.
I installed it also to other PC with SATA DVDRW, (where there is no DMA ) but still the transfer speed is somewhere below 2.4. It looks like it remains close to the level of the very first sectors.
Perhaps this function may be disabled in trial version or just a bug.