Hi. I own a TSSTcorp SH-S223C DVD+RW drive that I'm using with DT Pro (trial).
My problem is that sometimes DT allows me to read a specific disc (original non-copy) only at 6x speed, even though the drive supports 12x. If I eject the disc and enter it again then sometimes DT will allow me to select 6x, 8x, 12x, 16x and sometimes it only allows 6x - it seems completely random what speed I am allowed to select, but I did notice that whenever Daemon Tools allows 6x only, the disc doesn't spin up to a hearable speed when inserted like it does when DT allows the other speeds.

As a side note I can say that Alcohol 120% ALWAYS allows me to select a wide range of speeds (1x, 2x, 4x, 6x, 8x, 10x, 12x, 16x, 18x, 20x, 22x).

Why does it change over time in DT?