All right ... did some more thorough testing last night
... ripped the given CD 4 times with the four possible combinations of C2/caching settings and guess what ? 4 different results after wav compare with EAC ... all right, the differences are somewhat marginal cause the maximum sample value difference shown in sound forge is about 2500 (maybe 9 wrong bits or so ...), but I doubt that this particular drive is suited for DAE very well ... I will compare its ripping results with my other drives (my Plex is sooo slow on ripping this disc) during the next week so I can see which read mode is the correct one for the Toshi SD-M 1612 ...