[{HVY-E}Jinxx]

My pc is getting old, and I am building a new one. I want to move my current harddisk (WD raptor - 10.000 rpm) to the new pc, and add a WD Caviar (1 TB) as well. I am wondering what configuration would give me the best performance when playing IL2: should I install the OS on the faster disk, and Il2 on the large disk, or the other way around?

Correct,
Put Windows on the 10000 rpm drive and all your games/Program files on the 1tb drive.