When I used ASUS DRW-1608P to play a DVD movie, it used full speed all the time, and generated lots of noise. It was very annoying. So, I used Nero DriveSpeed v.3.01 to reduce the reading speed. Two strange things happened. Firstly, Nero only detects two speed settings (40X and 24X) available. Seconly, I tried to select 24X from the drop-down menu, but the drive failed to response. The current reading speed stayed at 40X. I also tried to use Asus CD-ROM Speed Setting Utility (cdspeed.exe) to lower the reading speed. It also failed.
For your information, I have tried ASUS firmware version 1.40 and 1.57, and Pioneer A09 v. 1.55. I could not adjust the speed in all cases. Do you think having two speed settings only is strange? Do I have a faulty reader? Any suggestions?